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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
42 changed files with 382 additions and 385 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
services/repository/check.go
View File

@@ -23,7 +23,7 @@ import (
)
// GitFsckRepos calls 'git fsck' to check repository health.
func GitFsckRepos(ctx context.Context, timeout time.Duration, args []git.CmdArg) error {
func GitFsckRepos(ctx context.Context, timeout time.Duration, args git.TrustedCmdArgs) error {
log.Trace("Doing: GitFsck")
if err := db.Iterate(
@@ -47,10 +47,10 @@ func GitFsckRepos(ctx context.Context, timeout time.Duration, args []git.CmdArg)
}
// GitFsckRepo calls 'git fsck' to check an individual repository's health.
func GitFsckRepo(ctx context.Context, repo *repo_model.Repository, timeout time.Duration, args []git.CmdArg) error {
func GitFsckRepo(ctx context.Context, repo *repo_model.Repository, timeout time.Duration, args git.TrustedCmdArgs) error {
log.Trace("Running health check on repository %-v", repo)
repoPath := repo.RepoPath()
if err := git.Fsck(ctx, repoPath, timeout, args...); err != nil {
if err := git.Fsck(ctx, repoPath, timeout, args); err != nil {
log.Warn("Failed to health check repository (%-v): %v", repo, err)
if err = system_model.CreateRepositoryNotice("Failed to health check repository (%s): %v", repo.FullName(), err); err != nil {
log.Error("CreateRepositoryNotice: %v", err)
@@ -60,9 +60,8 @@ func GitFsckRepo(ctx context.Context, repo *repo_model.Repository, timeout time.
}
// GitGcRepos calls 'git gc' to remove unnecessary files and optimize the local repository
func GitGcRepos(ctx context.Context, timeout time.Duration, args ...git.CmdArg) error {
func GitGcRepos(ctx context.Context, timeout time.Duration, args git.TrustedCmdArgs) error {
log.Trace("Doing: GitGcRepos")
args = append([]git.CmdArg{"gc"}, args...)
if err := db.Iterate(
ctx,
@@ -86,9 +85,9 @@ func GitGcRepos(ctx context.Context, timeout time.Duration, args ...git.CmdArg)
}
// GitGcRepo calls 'git gc' to remove unnecessary files and optimize the local repository
func GitGcRepo(ctx context.Context, repo *repo_model.Repository, timeout time.Duration, args []git.CmdArg) error {
func GitGcRepo(ctx context.Context, repo *repo_model.Repository, timeout time.Duration, args git.TrustedCmdArgs) error {
log.Trace("Running git gc on %-v", repo)
command := git.NewCommand(ctx, args...).
command := git.NewCommand(ctx, "gc").AddArguments(args...).
SetDescription(fmt.Sprintf("Repository Garbage Collection: %s", repo.FullName()))
var stdout string
var err error

8
services/repository/files/patch.go
View File

@@ -141,14 +141,12 @@ func ApplyDiffPatch(ctx context.Context, repo *repo_model.Repository, doer *user
stdout := &strings.Builder{}
stderr := &strings.Builder{}
args := []git.CmdArg{"apply", "--index", "--recount", "--cached", "--ignore-whitespace", "--whitespace=fix", "--binary"}
cmdApply := git.NewCommand(ctx, "apply", "--index", "--recount", "--cached", "--ignore-whitespace", "--whitespace=fix", "--binary")
if git.CheckGitVersionAtLeast("2.32") == nil {
args = append(args, "-3")
cmdApply.AddArguments("-3")
}
cmd := git.NewCommand(ctx, args...)
if err := cmd.Run(&git.RunOpts{
if err := cmdApply.Run(&git.RunOpts{
Dir: t.basePath,
Stdout: stdout,
Stderr: stderr,

14
services/repository/files/temp_repo.go
View File

@@ -233,11 +233,9 @@ func (t *TemporaryUploadRepository) CommitTreeWithDate(parent string, author, co
_, _ = messageBytes.WriteString(message)
_, _ = messageBytes.WriteString("\n")
var args []git.CmdArg
cmdCommitTree := git.NewCommand(t.ctx, "commit-tree").AddDynamicArguments(treeHash)
if parent != "" {
args = []git.CmdArg{"commit-tree", git.CmdArgCheck(treeHash), "-p", git.CmdArgCheck(parent)}
} else {
args = []git.CmdArg{"commit-tree", git.CmdArgCheck(treeHash)}
cmdCommitTree.AddOptionValues("-p", parent)
}
var sign bool
@@ -249,7 +247,7 @@ func (t *TemporaryUploadRepository) CommitTreeWithDate(parent string, author, co
sign, keyID, signer, _ = asymkey_service.SignInitialCommit(t.ctx, t.repo.RepoPath(), author)
}
if sign {
args = append(args, git.CmdArg("-S"+keyID))
cmdCommitTree.AddOptionFormat("-S%s", keyID)
if t.repo.GetTrustModel() == repo_model.CommitterTrustModel || t.repo.GetTrustModel() == repo_model.CollaboratorCommitterTrustModel {
if committerSig.Name != authorSig.Name || committerSig.Email != authorSig.Email {
// Add trailers
@@ -264,7 +262,7 @@ func (t *TemporaryUploadRepository) CommitTreeWithDate(parent string, author, co
committerSig = signer
}
} else {
args = append(args, "--no-gpg-sign")
cmdCommitTree.AddArguments("--no-gpg-sign")
}
if signoff {
@@ -281,7 +279,7 @@ func (t *TemporaryUploadRepository) CommitTreeWithDate(parent string, author, co
stdout := new(bytes.Buffer)
stderr := new(bytes.Buffer)
if err := git.NewCommand(t.ctx, args...).
if err := cmdCommitTree.
Run(&git.RunOpts{
Env: env,
Dir: t.basePath,
@@ -364,7 +362,7 @@ func (t *TemporaryUploadRepository) DiffIndex() (*gitdiff.Diff, error) {
t.repo.FullName(), err, stderr)
}
diff.NumFiles, diff.TotalAddition, diff.TotalDeletion, err = git.GetDiffShortStat(t.ctx, t.basePath, "--cached", "HEAD")
diff.NumFiles, diff.TotalAddition, diff.TotalDeletion, err = git.GetDiffShortStat(t.ctx, t.basePath, git.TrustedCmdArgs{"--cached"}, "HEAD")
if err != nil {
return nil, err
}

2
services/repository/files/update.go
View File

@@ -370,7 +370,7 @@ func CreateOrUpdateRepoFile(ctx context.Context, repo *repo_model.Repository, do
if setting.LFS.StartServer && hasOldBranch {
// Check there is no way this can return multiple infos
filename2attribute2info, err := t.gitRepo.CheckAttribute(git.CheckAttributeOpts{
Attributes: []git.CmdArg{"filter"},
Attributes: []string{"filter"},
Filenames: []string{treePath},
CachedOnly: true,
})

2
services/repository/files/upload.go
View File

@@ -96,7 +96,7 @@ func UploadRepoFiles(ctx context.Context, repo *repo_model.Repository, doer *use
var filename2attribute2info map[string]map[string]string
if setting.LFS.StartServer {
filename2attribute2info, err = t.gitRepo.CheckAttribute(git.CheckAttributeOpts{
Attributes: []git.CmdArg{"filter"},
Attributes: []string{"filter"},
Filenames: names,
CachedOnly: true,
})