mirror of
https://github.com/go-gitea/gitea.git
synced 2024-10-31 08:37:35 -04:00
dcd9fc7ee8
Follow #21464 Make all git command arguments strictly safe. Most changes are one-to-one replacing, keep all existing logic.
503 lines
15 KiB
Go
503 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 files
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import (
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"bytes"
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"context"
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"fmt"
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"path"
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"strings"
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"time"
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"code.gitea.io/gitea/models"
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git_model "code.gitea.io/gitea/models/git"
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repo_model "code.gitea.io/gitea/models/repo"
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user_model "code.gitea.io/gitea/models/user"
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"code.gitea.io/gitea/modules/charset"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/lfs"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/structs"
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"code.gitea.io/gitea/modules/util"
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asymkey_service "code.gitea.io/gitea/services/asymkey"
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stdcharset "golang.org/x/net/html/charset"
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"golang.org/x/text/transform"
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)
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// IdentityOptions for a person's identity like an author or committer
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type IdentityOptions struct {
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Name string
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Email string
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}
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// CommitDateOptions store dates for GIT_AUTHOR_DATE and GIT_COMMITTER_DATE
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type CommitDateOptions struct {
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Author time.Time
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Committer time.Time
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}
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// UpdateRepoFileOptions holds the repository file update options
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type UpdateRepoFileOptions struct {
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LastCommitID string
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OldBranch string
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NewBranch string
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TreePath string
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FromTreePath string
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Message string
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Content string
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SHA string
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IsNewFile bool
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Author *IdentityOptions
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Committer *IdentityOptions
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Dates *CommitDateOptions
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Signoff bool
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}
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func detectEncodingAndBOM(entry *git.TreeEntry, repo *repo_model.Repository) (string, bool) {
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reader, err := entry.Blob().DataAsync()
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if err != nil {
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// return default
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return "UTF-8", false
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}
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defer reader.Close()
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buf := make([]byte, 1024)
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n, err := util.ReadAtMost(reader, buf)
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if err != nil {
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// return default
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return "UTF-8", false
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}
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buf = buf[:n]
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if setting.LFS.StartServer {
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pointer, _ := lfs.ReadPointerFromBuffer(buf)
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if pointer.IsValid() {
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meta, err := git_model.GetLFSMetaObjectByOid(repo.ID, pointer.Oid)
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if err != nil && err != git_model.ErrLFSObjectNotExist {
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// return default
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return "UTF-8", false
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}
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if meta != nil {
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dataRc, err := lfs.ReadMetaObject(pointer)
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if err != nil {
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// return default
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return "UTF-8", false
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}
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defer dataRc.Close()
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buf = make([]byte, 1024)
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n, err = util.ReadAtMost(dataRc, buf)
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if err != nil {
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// return default
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return "UTF-8", false
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}
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buf = buf[:n]
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}
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}
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}
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encoding, err := charset.DetectEncoding(buf)
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if err != nil {
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// just default to utf-8 and no bom
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return "UTF-8", false
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}
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if encoding == "UTF-8" {
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return encoding, bytes.Equal(buf[0:3], charset.UTF8BOM)
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}
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charsetEncoding, _ := stdcharset.Lookup(encoding)
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if charsetEncoding == nil {
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return "UTF-8", false
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}
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result, n, err := transform.String(charsetEncoding.NewDecoder(), string(buf))
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if err != nil {
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// return default
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return "UTF-8", false
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}
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if n > 2 {
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return encoding, bytes.Equal([]byte(result)[0:3], charset.UTF8BOM)
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}
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return encoding, false
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}
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// CreateOrUpdateRepoFile adds or updates a file in the given repository
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func CreateOrUpdateRepoFile(ctx context.Context, repo *repo_model.Repository, doer *user_model.User, opts *UpdateRepoFileOptions) (*structs.FileResponse, error) {
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// If no branch name is set, assume default branch
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if opts.OldBranch == "" {
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opts.OldBranch = repo.DefaultBranch
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}
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if opts.NewBranch == "" {
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opts.NewBranch = opts.OldBranch
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}
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gitRepo, closer, err := git.RepositoryFromContextOrOpen(ctx, repo.RepoPath())
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if err != nil {
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return nil, err
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}
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defer closer.Close()
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// oldBranch must exist for this operation
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if _, err := gitRepo.GetBranch(opts.OldBranch); err != nil && !repo.IsEmpty {
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return nil, err
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}
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// A NewBranch can be specified for the file to be created/updated in a new branch.
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// Check to make sure the branch does not already exist, otherwise we can't proceed.
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// If we aren't branching to a new branch, make sure user can commit to the given branch
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if opts.NewBranch != opts.OldBranch {
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existingBranch, err := gitRepo.GetBranch(opts.NewBranch)
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if existingBranch != nil {
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return nil, models.ErrBranchAlreadyExists{
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BranchName: opts.NewBranch,
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}
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}
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if err != nil && !git.IsErrBranchNotExist(err) {
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return nil, err
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}
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} else if err := VerifyBranchProtection(ctx, repo, doer, opts.OldBranch, opts.TreePath); err != nil {
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return nil, err
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}
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// If FromTreePath is not set, set it to the opts.TreePath
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if opts.TreePath != "" && opts.FromTreePath == "" {
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opts.FromTreePath = opts.TreePath
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}
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// Check that the path given in opts.treePath is valid (not a git path)
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treePath := CleanUploadFileName(opts.TreePath)
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if treePath == "" {
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return nil, models.ErrFilenameInvalid{
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Path: opts.TreePath,
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}
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}
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// If there is a fromTreePath (we are copying it), also clean it up
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fromTreePath := CleanUploadFileName(opts.FromTreePath)
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if fromTreePath == "" && opts.FromTreePath != "" {
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return nil, models.ErrFilenameInvalid{
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Path: opts.FromTreePath,
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}
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}
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message := strings.TrimSpace(opts.Message)
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author, committer := GetAuthorAndCommitterUsers(opts.Author, opts.Committer, doer)
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t, err := NewTemporaryUploadRepository(ctx, repo)
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if err != nil {
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log.Error("%v", err)
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}
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defer t.Close()
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hasOldBranch := true
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if err := t.Clone(opts.OldBranch); err != nil {
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if !git.IsErrBranchNotExist(err) || !repo.IsEmpty {
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return nil, err
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}
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if err := t.Init(); err != nil {
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return nil, err
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}
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hasOldBranch = false
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opts.LastCommitID = ""
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}
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if hasOldBranch {
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if err := t.SetDefaultIndex(); err != nil {
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return nil, err
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}
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}
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encoding := "UTF-8"
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bom := false
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executable := false
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if hasOldBranch {
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// Get the commit of the original branch
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commit, err := t.GetBranchCommit(opts.OldBranch)
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if err != nil {
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return nil, err // Couldn't get a commit for the branch
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}
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// Assigned LastCommitID in opts if it hasn't been set
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if opts.LastCommitID == "" {
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opts.LastCommitID = commit.ID.String()
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} else {
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lastCommitID, err := t.gitRepo.ConvertToSHA1(opts.LastCommitID)
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if err != nil {
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return nil, fmt.Errorf("ConvertToSHA1: Invalid last commit ID: %v", err)
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}
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opts.LastCommitID = lastCommitID.String()
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}
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if !opts.IsNewFile {
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fromEntry, err := commit.GetTreeEntryByPath(fromTreePath)
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if err != nil {
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return nil, err
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}
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if opts.SHA != "" {
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// If a SHA was given and the SHA given doesn't match the SHA of the fromTreePath, throw error
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if opts.SHA != fromEntry.ID.String() {
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return nil, models.ErrSHADoesNotMatch{
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Path: treePath,
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GivenSHA: opts.SHA,
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CurrentSHA: fromEntry.ID.String(),
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}
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}
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} else if opts.LastCommitID != "" {
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// If a lastCommitID was given and it doesn't match the commitID of the head of the branch throw
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// an error, but only if we aren't creating a new branch.
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if commit.ID.String() != opts.LastCommitID && opts.OldBranch == opts.NewBranch {
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if changed, err := commit.FileChangedSinceCommit(treePath, opts.LastCommitID); err != nil {
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return nil, err
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} else if changed {
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return nil, models.ErrCommitIDDoesNotMatch{
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GivenCommitID: opts.LastCommitID,
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CurrentCommitID: opts.LastCommitID,
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}
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}
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// The file wasn't modified, so we are good to delete it
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}
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} else {
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// When updating a file, a lastCommitID or SHA needs to be given to make sure other commits
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// haven't been made. We throw an error if one wasn't provided.
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return nil, models.ErrSHAOrCommitIDNotProvided{}
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}
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encoding, bom = detectEncodingAndBOM(fromEntry, repo)
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executable = fromEntry.IsExecutable()
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}
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// For the path where this file will be created/updated, we need to make
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// sure no parts of the path are existing files or links except for the last
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// item in the path which is the file name, and that shouldn't exist IF it is
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// a new file OR is being moved to a new path.
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treePathParts := strings.Split(treePath, "/")
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subTreePath := ""
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for index, part := range treePathParts {
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subTreePath = path.Join(subTreePath, part)
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entry, err := commit.GetTreeEntryByPath(subTreePath)
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if err != nil {
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if git.IsErrNotExist(err) {
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// Means there is no item with that name, so we're good
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break
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}
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return nil, err
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}
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if index < len(treePathParts)-1 {
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if !entry.IsDir() {
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return nil, models.ErrFilePathInvalid{
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Message: fmt.Sprintf("a file exists where you’re trying to create a subdirectory [path: %s]", subTreePath),
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Path: subTreePath,
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Name: part,
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Type: git.EntryModeBlob,
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}
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}
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} else if entry.IsLink() {
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return nil, models.ErrFilePathInvalid{
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Message: fmt.Sprintf("a symbolic link exists where you’re trying to create a subdirectory [path: %s]", subTreePath),
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Path: subTreePath,
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Name: part,
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Type: git.EntryModeSymlink,
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}
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} else if entry.IsDir() {
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return nil, models.ErrFilePathInvalid{
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Message: fmt.Sprintf("a directory exists where you’re trying to create a file [path: %s]", subTreePath),
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Path: subTreePath,
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Name: part,
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Type: git.EntryModeTree,
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}
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} else if fromTreePath != treePath || opts.IsNewFile {
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// The entry shouldn't exist if we are creating new file or moving to a new path
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return nil, models.ErrRepoFileAlreadyExists{
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Path: treePath,
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}
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}
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}
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}
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// Get the two paths (might be the same if not moving) from the index if they exist
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filesInIndex, err := t.LsFiles(opts.TreePath, opts.FromTreePath)
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if err != nil {
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return nil, fmt.Errorf("UpdateRepoFile: %v", err)
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}
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// If is a new file (not updating) then the given path shouldn't exist
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if opts.IsNewFile {
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for _, file := range filesInIndex {
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if file == opts.TreePath {
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return nil, models.ErrRepoFileAlreadyExists{
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Path: opts.TreePath,
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}
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}
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}
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}
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// Remove the old path from the tree
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if fromTreePath != treePath && len(filesInIndex) > 0 {
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for _, file := range filesInIndex {
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if file == fromTreePath {
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if err := t.RemoveFilesFromIndex(opts.FromTreePath); err != nil {
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return nil, err
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}
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}
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}
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}
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content := opts.Content
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if bom {
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content = string(charset.UTF8BOM) + content
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}
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if encoding != "UTF-8" {
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charsetEncoding, _ := stdcharset.Lookup(encoding)
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if charsetEncoding != nil {
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result, _, err := transform.String(charsetEncoding.NewEncoder(), content)
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if err != nil {
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// Look if we can't encode back in to the original we should just stick with utf-8
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log.Error("Error re-encoding %s (%s) as %s - will stay as UTF-8: %v", opts.TreePath, opts.FromTreePath, encoding, err)
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result = content
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}
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content = result
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} else {
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log.Error("Unknown encoding: %s", encoding)
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}
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}
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// Reset the opts.Content to our adjusted content to ensure that LFS gets the correct content
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opts.Content = content
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var lfsMetaObject *git_model.LFSMetaObject
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if setting.LFS.StartServer && hasOldBranch {
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// Check there is no way this can return multiple infos
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filename2attribute2info, err := t.gitRepo.CheckAttribute(git.CheckAttributeOpts{
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Attributes: []git.CmdArg{"filter"},
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Filenames: []string{treePath},
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CachedOnly: true,
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})
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if err != nil {
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return nil, err
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}
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if filename2attribute2info[treePath] != nil && filename2attribute2info[treePath]["filter"] == "lfs" {
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// OK so we are supposed to LFS this data!
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pointer, err := lfs.GeneratePointer(strings.NewReader(opts.Content))
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if err != nil {
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return nil, err
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}
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lfsMetaObject = &git_model.LFSMetaObject{Pointer: pointer, RepositoryID: repo.ID}
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content = pointer.StringContent()
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}
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}
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// Add the object to the database
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objectHash, err := t.HashObject(strings.NewReader(content))
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if err != nil {
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return nil, err
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}
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// Add the object to the index
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if executable {
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if err := t.AddObjectToIndex("100755", objectHash, treePath); err != nil {
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return nil, err
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}
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} else {
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if err := t.AddObjectToIndex("100644", objectHash, treePath); err != nil {
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return nil, err
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}
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}
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// Now write the tree
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treeHash, err := t.WriteTree()
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if err != nil {
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return nil, err
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}
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// Now commit the tree
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var commitHash string
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if opts.Dates != nil {
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commitHash, err = t.CommitTreeWithDate(opts.LastCommitID, author, committer, treeHash, message, opts.Signoff, opts.Dates.Author, opts.Dates.Committer)
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} else {
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commitHash, err = t.CommitTree(opts.LastCommitID, author, committer, treeHash, message, opts.Signoff)
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}
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if err != nil {
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return nil, err
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}
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if lfsMetaObject != nil {
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// We have an LFS object - create it
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lfsMetaObject, err = git_model.NewLFSMetaObject(lfsMetaObject)
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if err != nil {
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return nil, err
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}
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contentStore := lfs.NewContentStore()
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exist, err := contentStore.Exists(lfsMetaObject.Pointer)
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if err != nil {
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return nil, err
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}
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if !exist {
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if err := contentStore.Put(lfsMetaObject.Pointer, strings.NewReader(opts.Content)); err != nil {
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if _, err2 := git_model.RemoveLFSMetaObjectByOid(repo.ID, lfsMetaObject.Oid); err2 != nil {
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return nil, fmt.Errorf("Error whilst removing failed inserted LFS object %s: %v (Prev Error: %v)", lfsMetaObject.Oid, err2, err)
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}
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return nil, err
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}
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}
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}
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// Then push this tree to NewBranch
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if err := t.Push(doer, commitHash, opts.NewBranch); err != nil {
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log.Error("%T %v", err, err)
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return nil, err
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}
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commit, err := t.GetCommit(commitHash)
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if err != nil {
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return nil, err
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}
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file, err := GetFileResponseFromCommit(ctx, repo, commit, opts.NewBranch, treePath)
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if err != nil {
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return nil, err
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}
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return file, nil
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}
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// VerifyBranchProtection verify the branch protection for modifying the given treePath on the given branch
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func VerifyBranchProtection(ctx context.Context, repo *repo_model.Repository, doer *user_model.User, branchName, treePath string) error {
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protectedBranch, err := git_model.GetProtectedBranchBy(ctx, repo.ID, branchName)
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if err != nil {
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return err
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}
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if protectedBranch != nil {
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isUnprotectedFile := false
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glob := protectedBranch.GetUnprotectedFilePatterns()
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if len(glob) != 0 {
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isUnprotectedFile = protectedBranch.IsUnprotectedFile(glob, treePath)
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}
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if !protectedBranch.CanUserPush(doer.ID) && !isUnprotectedFile {
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return models.ErrUserCannotCommit{
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UserName: doer.LowerName,
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}
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}
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if protectedBranch.RequireSignedCommits {
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_, _, _, err := asymkey_service.SignCRUDAction(ctx, repo.RepoPath(), doer, repo.RepoPath(), branchName)
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if err != nil {
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if !asymkey_service.IsErrWontSign(err) {
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return err
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}
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return models.ErrUserCannotCommit{
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UserName: doer.LowerName,
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}
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}
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}
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patterns := protectedBranch.GetProtectedFilePatterns()
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for _, pat := range patterns {
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if pat.Match(strings.ToLower(treePath)) {
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return models.ErrFilePathProtected{
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Path: treePath,
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}
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}
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}
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}
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return nil
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}
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