cbf923e87b
Refactor Hash interfaces and centralize hash function. This will allow easier introduction of different hash function later on. This forms the "no-op" part of the SHA256 enablement patch.
124 lines
3.4 KiB
Go
124 lines
3.4 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package private
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"os"
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asymkey_model "code.gitea.io/gitea/models/asymkey"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/log"
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)
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// This file contains commit verification functions for refs passed across in hooks
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func verifyCommits(oldCommitID, newCommitID string, repo *git.Repository, env []string) error {
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stdoutReader, stdoutWriter, err := os.Pipe()
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if err != nil {
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log.Error("Unable to create os.Pipe for %s", repo.Path)
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return err
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}
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defer func() {
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_ = stdoutReader.Close()
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_ = stdoutWriter.Close()
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}()
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var command *git.Command
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objectFormat, _ := repo.GetObjectFormat()
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if oldCommitID == objectFormat.Empty().String() {
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// When creating a new branch, the oldCommitID is empty, by using "newCommitID --not --all":
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// List commits that are reachable by following the newCommitID, exclude "all" existing heads/tags commits
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// So, it only lists the new commits received, doesn't list the commits already present in the receiving repository
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command = git.NewCommand(repo.Ctx, "rev-list").AddDynamicArguments(newCommitID).AddArguments("--not", "--all")
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} else {
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command = git.NewCommand(repo.Ctx, "rev-list").AddDynamicArguments(oldCommitID + "..." + newCommitID)
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}
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// This is safe as force pushes are already forbidden
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err = command.Run(&git.RunOpts{
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Env: env,
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Dir: repo.Path,
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Stdout: stdoutWriter,
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PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
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_ = stdoutWriter.Close()
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err := readAndVerifyCommitsFromShaReader(stdoutReader, repo, env)
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if err != nil {
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log.Error("%v", err)
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cancel()
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}
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_ = stdoutReader.Close()
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return err
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},
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})
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if err != nil && !isErrUnverifiedCommit(err) {
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log.Error("Unable to check commits from %s to %s in %s: %v", oldCommitID, newCommitID, repo.Path, err)
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}
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return err
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}
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func readAndVerifyCommitsFromShaReader(input io.ReadCloser, repo *git.Repository, env []string) error {
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scanner := bufio.NewScanner(input)
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for scanner.Scan() {
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line := scanner.Text()
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err := readAndVerifyCommit(line, repo, env)
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if err != nil {
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log.Error("%v", err)
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return err
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}
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}
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return scanner.Err()
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}
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func readAndVerifyCommit(sha string, repo *git.Repository, env []string) error {
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stdoutReader, stdoutWriter, err := os.Pipe()
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if err != nil {
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log.Error("Unable to create pipe for %s: %v", repo.Path, err)
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return err
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}
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defer func() {
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_ = stdoutReader.Close()
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_ = stdoutWriter.Close()
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}()
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objectFormat, _ := repo.GetObjectFormat()
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commitID := objectFormat.MustIDFromString(sha)
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return git.NewCommand(repo.Ctx, "cat-file", "commit").AddDynamicArguments(sha).
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Run(&git.RunOpts{
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Env: env,
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Dir: repo.Path,
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Stdout: stdoutWriter,
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PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
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_ = stdoutWriter.Close()
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commit, err := git.CommitFromReader(repo, commitID, stdoutReader)
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if err != nil {
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return err
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}
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verification := asymkey_model.ParseCommitWithSignature(ctx, commit)
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if !verification.Verified {
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cancel()
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return &errUnverifiedCommit{
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commit.ID.String(),
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}
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}
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return nil
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},
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})
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}
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type errUnverifiedCommit struct {
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sha string
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}
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func (e *errUnverifiedCommit) Error() string {
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return fmt.Sprintf("Unverified commit: %s", e.sha)
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}
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func isErrUnverifiedCommit(err error) bool {
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_, ok := err.(*errUnverifiedCommit)
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return ok
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}
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