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Refactor git command package to improve security and maintainability (#22678)

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This PR follows #21535 (and replace #22592)

## Review without space diff

https://github.com/go-gitea/gitea/pull/22678/files?diff=split&w=1

## Purpose of this PR

1. Make git module command completely safe (risky user inputs won't be
passed as argument option anymore)
2. Avoid low-level mistakes like
https://github.com/go-gitea/gitea/pull/22098#discussion_r1045234918
3. Remove deprecated and dirty `CmdArgCheck` function, hide the `CmdArg`
type
4. Simplify code when using git command

## The main idea of this PR

* Move the `git.CmdArg` to the `internal` package, then no other package
except `git` could use it. Then developers could never do
`AddArguments(git.CmdArg(userInput))` any more.
* Introduce `git.ToTrustedCmdArgs`, it's for user-provided and already
trusted arguments. It's only used in a few cases, for example: use git
arguments from config file, help unit test with some arguments.
* Introduce `AddOptionValues` and `AddOptionFormat`, they make code more
clear and simple:
    * Before: `AddArguments("-m").AddDynamicArguments(message)`
    * After: `AddOptionValues("-m", message)`
    * -
* Before: `AddArguments(git.CmdArg(fmt.Sprintf("--author='%s <%s>'",
sig.Name, sig.Email)))`
* After: `AddOptionFormat("--author='%s <%s>'", sig.Name, sig.Email)`

## FAQ

### Why these changes were not done in #21535 ?

#21535 is mainly a search&replace, it did its best to not change too
much logic.

Making the framework better needs a lot of changes, so this separate PR
is needed as the second step.


### The naming of `AddOptionXxx`

According to git's manual, the `--xxx` part is called `option`.

### How can it guarantee that `internal.CmdArg` won't be not misused?

Go's specification guarantees that. Trying to access other package's
internal package causes compilation error.

And, `golangci-lint` also denies the git/internal package. Only the
`git/command.go` can use it carefully.

### There is still a `ToTrustedCmdArgs`, will it still allow developers
to make mistakes and pass untrusted arguments?

Generally speaking, no. Because when using `ToTrustedCmdArgs`, the code
will be very complex (see the changes for examples). Then developers and
reviewers can know that something might be unreasonable.

### Why there was a `CmdArgCheck` and why it's removed?

At the moment of #21535, to reduce unnecessary changes, `CmdArgCheck`
was introduced as a hacky patch. Now, almost all code could be written
as `cmd := NewCommand(); cmd.AddXxx(...)`, then there is no need for
`CmdArgCheck` anymore.


### Why many codes for `signArg == ""` is deleted?

Because in the old code, `signArg` could never be empty string, it's
either `-S[key-id]` or `--no-gpg-sign`. So the `signArg == ""` is just
dead code.

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
wxiaoguang 2023-02-04 10:30:43 +08:00 • committed by GitHub
parent 3c5655ce18
commit 6bc3079c00
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
42 changed files with 382 additions and 385 deletions
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92
services/pull/merge.go
View file

@ -370,16 +370,16 @@ func rawMerge(ctx context.Context, pr *issues_model.PullRequest, doer *user_mode
sig := doer.NewGitSig()
committer := sig
// Determine if we should sign
var signArg git.CmdArg
sign, keyID, signer, _ := asymkey_service.SignMerge(ctx, pr, doer, tmpBasePath, "HEAD", trackingBranch)
// Determine if we should sign. If no signKeyID, use --no-gpg-sign to countermand the sign config (from gitconfig)
var signArgs git.TrustedCmdArgs
sign, signKeyID, signer, _ := asymkey_service.SignMerge(ctx, pr, doer, tmpBasePath, "HEAD", trackingBranch)
if sign {
signArg = git.CmdArg("-S" + keyID)
if pr.BaseRepo.GetTrustModel() == repo_model.CommitterTrustModel || pr.BaseRepo.GetTrustModel() == repo_model.CollaboratorCommitterTrustModel {
committer = signer
}
signArgs = git.ToTrustedCmdArgs([]string{"-S" + signKeyID})
} else {
signArg = git.CmdArg("--no-gpg-sign")
signArgs = append(signArgs, "--no-gpg-sign")
}
commitTimeStr := time.Now().Format(time.RFC3339)
@ -403,7 +403,7 @@ func rawMerge(ctx context.Context, pr *issues_model.PullRequest, doer *user_mode
return "", err
}
if err := commitAndSignNoAuthor(ctx, pr, message, signArg, tmpBasePath, env); err != nil {
if err := commitAndSignNoAuthor(ctx, pr, message, signArgs, tmpBasePath, env); err != nil {
log.Error("Unable to make final commit: %v", err)
return "", err
}
@ -505,7 +505,7 @@ func rawMerge(ctx context.Context, pr *issues_model.PullRequest, doer *user_mode
return "", err
}
if mergeStyle == repo_model.MergeStyleRebaseMerge {
if err := commitAndSignNoAuthor(ctx, pr, message, signArg, tmpBasePath, env); err != nil {
if err := commitAndSignNoAuthor(ctx, pr, message, signArgs, tmpBasePath, env); err != nil {
log.Error("Unable to make final commit: %v", err)
return "", err
}
@ -523,35 +523,22 @@ func rawMerge(ctx context.Context, pr *issues_model.PullRequest, doer *user_mode
return "", fmt.Errorf("LoadPoster: %w", err)
}
sig := pr.Issue.Poster.NewGitSig()
if signArg == "" {
if err := git.NewCommand(ctx, "commit", git.CmdArg(fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email)), "-m").AddDynamicArguments(message).
Run(&git.RunOpts{
Env: env,
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("git commit [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
return "", fmt.Errorf("git commit [%s:%s -> %s:%s]: %w\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
}
} else {
if setting.Repository.PullRequest.AddCoCommitterTrailers && committer.String() != sig.String() {
// add trailer
message += fmt.Sprintf("\nCo-authored-by: %s\nCo-committed-by: %s\n", sig.String(), sig.String())
}
if err := git.NewCommand(ctx, "commit").
AddArguments(signArg).
AddArguments(git.CmdArg(fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email))).
AddArguments("-m").AddDynamicArguments(message).
Run(&git.RunOpts{
Env: env,
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("git commit [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
return "", fmt.Errorf("git commit [%s:%s -> %s:%s]: %w\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
}
if setting.Repository.PullRequest.AddCoCommitterTrailers && committer.String() != sig.String() {
// add trailer
message += fmt.Sprintf("\nCo-authored-by: %s\nCo-committed-by: %s\n", sig.String(), sig.String())
}
if err := git.NewCommand(ctx, "commit").
AddArguments(signArgs...).
AddOptionFormat("--author='%s <%s>'", sig.Name, sig.Email).
AddOptionValues("-m", message).
Run(&git.RunOpts{
Env: env,
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("git commit [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
return "", fmt.Errorf("git commit [%s:%s -> %s:%s]: %w\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
}
outbuf.Reset()
errbuf.Reset()
@ -649,30 +636,17 @@ func rawMerge(ctx context.Context, pr *issues_model.PullRequest, doer *user_mode
return mergeCommitID, nil
}
func commitAndSignNoAuthor(ctx context.Context, pr *issues_model.PullRequest, message string, signArg git.CmdArg, tmpBasePath string, env []string) error {
func commitAndSignNoAuthor(ctx context.Context, pr *issues_model.PullRequest, message string, signArgs git.TrustedCmdArgs, tmpBasePath string, env []string) error {
var outbuf, errbuf strings.Builder
if signArg == "" {
if err := git.NewCommand(ctx, "commit", "-m").AddDynamicArguments(message).
Run(&git.RunOpts{
Env: env,
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("git commit [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
return fmt.Errorf("git commit [%s:%s -> %s:%s]: %w\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
}
} else {
if err := git.NewCommand(ctx, "commit").AddArguments(signArg).AddArguments("-m").AddDynamicArguments(message).
Run(&git.RunOpts{
Env: env,
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("git commit [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
return fmt.Errorf("git commit [%s:%s -> %s:%s]: %w\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
}
if err := git.NewCommand(ctx, "commit").AddArguments(signArgs...).AddOptionValues("-m", message).
Run(&git.RunOpts{
Env: env,
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("git commit [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
return fmt.Errorf("git commit [%s:%s -> %s:%s]: %w\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
}
return nil
}

117
services/pull/patch.go
View file

@ -376,16 +376,16 @@ func checkConflicts(ctx context.Context, pr *issues_model.PullRequest, gitRepo *
prConfig := prUnit.PullRequestsConfig()
// 6. Prepare the arguments to apply the patch against the index
args := []git.CmdArg{"apply", "--check", "--cached"}
cmdApply := git.NewCommand(gitRepo.Ctx, "apply", "--check", "--cached")
if prConfig.IgnoreWhitespaceConflicts {
args = append(args, "--ignore-whitespace")
cmdApply.AddArguments("--ignore-whitespace")
}
is3way := false
if git.CheckGitVersionAtLeast("2.32.0") == nil {
args = append(args, "--3way")
cmdApply.AddArguments("--3way")
is3way = true
}
args = append(args, git.CmdArgCheck(patchPath))
cmdApply.AddDynamicArguments(patchPath)
// 7. Prep the pipe:
// - Here we could do the equivalent of:
@ -407,71 +407,70 @@ func checkConflicts(ctx context.Context, pr *issues_model.PullRequest, gitRepo *
// 8. Run the check command
conflict = false
err = git.NewCommand(gitRepo.Ctx, args...).
Run(&git.RunOpts{
Dir: tmpBasePath,
Stderr: stderrWriter,
PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
// Close the writer end of the pipe to begin processing
_ = stderrWriter.Close()
defer func() {
// Close the reader on return to terminate the git command if necessary
_ = stderrReader.Close()
}()
err = cmdApply.Run(&git.RunOpts{
Dir: tmpBasePath,
Stderr: stderrWriter,
PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
// Close the writer end of the pipe to begin processing
_ = stderrWriter.Close()
defer func() {
// Close the reader on return to terminate the git command if necessary
_ = stderrReader.Close()
}()
const prefix = "error: patch failed:"
const errorPrefix = "error: "
const threewayFailed = "Failed to perform three-way merge..."
const appliedPatchPrefix = "Applied patch to '"
const withConflicts = "' with conflicts."
const prefix = "error: patch failed:"
const errorPrefix = "error: "
const threewayFailed = "Failed to perform three-way merge..."
const appliedPatchPrefix = "Applied patch to '"
const withConflicts = "' with conflicts."
conflicts := make(container.Set[string])
conflicts := make(container.Set[string])
// Now scan the output from the command
scanner := bufio.NewScanner(stderrReader)
for scanner.Scan() {
line := scanner.Text()
log.Trace("PullRequest[%d].testPatch: stderr: %s", pr.ID, line)
if strings.HasPrefix(line, prefix) {
conflict = true
filepath := strings.TrimSpace(strings.Split(line[len(prefix):], ":")[0])
conflicts.Add(filepath)
} else if is3way && line == threewayFailed {
conflict = true
} else if strings.HasPrefix(line, errorPrefix) {
conflict = true
for _, suffix := range patchErrorSuffices {
if strings.HasSuffix(line, suffix) {
filepath := strings.TrimSpace(strings.TrimSuffix(line[len(errorPrefix):], suffix))
if filepath != "" {
conflicts.Add(filepath)
}
break
// Now scan the output from the command
scanner := bufio.NewScanner(stderrReader)
for scanner.Scan() {
line := scanner.Text()
log.Trace("PullRequest[%d].testPatch: stderr: %s", pr.ID, line)
if strings.HasPrefix(line, prefix) {
conflict = true
filepath := strings.TrimSpace(strings.Split(line[len(prefix):], ":")[0])
conflicts.Add(filepath)
} else if is3way && line == threewayFailed {
conflict = true
} else if strings.HasPrefix(line, errorPrefix) {
conflict = true
for _, suffix := range patchErrorSuffices {
if strings.HasSuffix(line, suffix) {
filepath := strings.TrimSpace(strings.TrimSuffix(line[len(errorPrefix):], suffix))
if filepath != "" {
conflicts.Add(filepath)
}
}
} else if is3way && strings.HasPrefix(line, appliedPatchPrefix) && strings.HasSuffix(line, withConflicts) {
conflict = true
filepath := strings.TrimPrefix(strings.TrimSuffix(line, withConflicts), appliedPatchPrefix)
if filepath != "" {
conflicts.Add(filepath)
break
}
}
// only list 10 conflicted files
if len(conflicts) >= 10 {
break
} else if is3way && strings.HasPrefix(line, appliedPatchPrefix) && strings.HasSuffix(line, withConflicts) {
conflict = true
filepath := strings.TrimPrefix(strings.TrimSuffix(line, withConflicts), appliedPatchPrefix)
if filepath != "" {
conflicts.Add(filepath)
}
}
if len(conflicts) > 0 {
pr.ConflictedFiles = make([]string, 0, len(conflicts))
for key := range conflicts {
pr.ConflictedFiles = append(pr.ConflictedFiles, key)
}
// only list 10 conflicted files
if len(conflicts) >= 10 {
break
}
}
return nil
},
})
if len(conflicts) > 0 {
pr.ConflictedFiles = make([]string, 0, len(conflicts))
for key := range conflicts {
pr.ConflictedFiles = append(pr.ConflictedFiles, key)
}
}
return nil
},
})
// 9. Check if the found conflictedfiles is non-zero, "err" could be non-nil, so we should ignore it if we found conflicts.
// Note: `"err" could be non-nil` is due that if enable 3-way merge, it doesn't return any error on found conflicts.