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Refactor legacy strange git operations (#22756)

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During the refactoring of the git module, I found there were some
strange operations. This PR tries to fix 2 of them

1. The empty argument `--` in repo_attribute.go, which was introduced by
#16773. It seems unnecessary because nothing else would be added later.
2. The complex git service logic in repo/http.go. 
* Before: the `hasAccess` only allow `service == "upload-pack" ||
service == "receive-pack"`
* After: unrelated code is removed. No need to call ToTrustedCmdArgs
anymore.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
wxiaoguang 2023-02-06 10:23:17 +08:00 committed by GitHub
parent d987ac6bf1
commit 50111c71c3
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 28 additions and 51 deletions
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3
modules/git/repo_attribute.go
View file

@ -135,8 +135,7 @@ func (c *CheckAttributeReader) Init(ctx context.Context) error {
c.env = append(c.env, "GIT_FLUSH=1")
// The empty "--" comes from #16773 , and it seems unnecessary because nothing else would be added later.
c.cmd.AddDynamicArguments(c.Attributes...).AddArguments("--")
c.cmd.AddDynamicArguments(c.Attributes...)
var err error

76
routers/web/repo/http.go
View file

@ -424,60 +424,40 @@ func (h *serviceHandler) sendFile(contentType, file string) {
// one or more key=value pairs separated by colons
var safeGitProtocolHeader = regexp.MustCompile(`^[0-9a-zA-Z]+=[0-9a-zA-Z]+(:[0-9a-zA-Z]+=[0-9a-zA-Z]+)*$`)
func getGitConfig(ctx gocontext.Context, option, dir string) string {
out, _, err := git.NewCommand(ctx, "config").AddDynamicArguments(option).RunStdString(&git.RunOpts{Dir: dir})
if err != nil {
log.Error("%v - %s", err, out)
func prepareGitCmdWithAllowedService(service string, h *serviceHandler) (*git.Command, error) {
if service == "receive-pack" && h.cfg.ReceivePack {
return git.NewCommand(h.r.Context(), "receive-pack"), nil
}
return out[0 : len(out)-1]
if service == "upload-pack" && h.cfg.UploadPack {
return git.NewCommand(h.r.Context(), "upload-pack"), nil
}
return nil, fmt.Errorf("service %q is not allowed", service)
}
func getConfigSetting(ctx gocontext.Context, service, dir string) bool {
service = strings.ReplaceAll(service, "-", "")
setting := getGitConfig(ctx, "http."+service, dir)
if service == "uploadpack" {
return setting != "false"
}
return setting == "true"
}
func hasAccess(ctx gocontext.Context, service string, h serviceHandler, checkContentType bool) bool {
if checkContentType {
if h.r.Header.Get("Content-Type") != fmt.Sprintf("application/x-git-%s-request", service) {
return false
}
}
if !(service == "upload-pack" || service == "receive-pack") {
return false
}
if service == "receive-pack" {
return h.cfg.ReceivePack
}
if service == "upload-pack" {
return h.cfg.UploadPack
}
return getConfigSetting(ctx, service, h.dir)
}
func serviceRPC(ctx gocontext.Context, h serviceHandler, service string) {
func serviceRPC(h *serviceHandler, service string) {
defer func() {
if err := h.r.Body.Close(); err != nil {
log.Error("serviceRPC: Close: %v", err)
}
}()
if !hasAccess(ctx, service, h, true) {
expectedContentType := fmt.Sprintf("application/x-git-%s-request", service)
if h.r.Header.Get("Content-Type") != expectedContentType {
log.Error("Content-Type (%q) doesn't match expected: %q", h.r.Header.Get("Content-Type"), expectedContentType)
h.w.WriteHeader(http.StatusUnauthorized)
return
}
cmd, err := prepareGitCmdWithAllowedService(service, h)
if err != nil {
log.Error("Failed to prepareGitCmdWithService: %v", err)
h.w.WriteHeader(http.StatusUnauthorized)
return
}
h.w.Header().Set("Content-Type", fmt.Sprintf("application/x-git-%s-result", service))
var err error
reqBody := h.r.Body
// Handle GZIP.
@ -498,8 +478,7 @@ func serviceRPC(ctx gocontext.Context, h serviceHandler, service string) {
}
var stderr bytes.Buffer
// the service is generated by ourselves, so it's safe to trust it
cmd := git.NewCommand(h.r.Context(), git.ToTrustedCmdArgs([]string{service})...).AddArguments("--stateless-rpc").AddDynamicArguments(h.dir)
cmd.AddArguments("--stateless-rpc").AddDynamicArguments(h.dir)
cmd.SetDescription(fmt.Sprintf("%s %s %s [repo_path: %s]", git.GitExecutable, service, "--stateless-rpc", h.dir))
if err := cmd.Run(&git.RunOpts{
Dir: h.dir,
@ -520,7 +499,7 @@ func serviceRPC(ctx gocontext.Context, h serviceHandler, service string) {
func ServiceUploadPack(ctx *context.Context) {
h := httpBase(ctx)
if h != nil {
serviceRPC(ctx, *h, "upload-pack")
serviceRPC(h, "upload-pack")
}
}
@ -528,7 +507,7 @@ func ServiceUploadPack(ctx *context.Context) {
func ServiceReceivePack(ctx *context.Context) {
h := httpBase(ctx)
if h != nil {
serviceRPC(ctx, *h, "receive-pack")
serviceRPC(h, "receive-pack")
}
}
@ -537,7 +516,7 @@ func getServiceType(r *http.Request) string {
if !strings.HasPrefix(serviceType, "git-") {
return ""
}
return strings.Replace(serviceType, "git-", "", 1)
return strings.TrimPrefix(serviceType, "git-")
}
func updateServerInfo(ctx gocontext.Context, dir string) []byte {
@ -563,16 +542,15 @@ func GetInfoRefs(ctx *context.Context) {
return
}
h.setHeaderNoCache()
if hasAccess(ctx, getServiceType(h.r), *h, false) {
service := getServiceType(h.r)
service := getServiceType(h.r)
cmd, err := prepareGitCmdWithAllowedService(service, h)
if err == nil {
if protocol := h.r.Header.Get("Git-Protocol"); protocol != "" && safeGitProtocolHeader.MatchString(protocol) {
h.environ = append(h.environ, "GIT_PROTOCOL="+protocol)
}
h.environ = append(os.Environ(), h.environ...)
// the service is generated by ourselves, so we can trust it
refs, _, err := git.NewCommand(ctx, git.ToTrustedCmdArgs([]string{service})...).AddArguments("--stateless-rpc", "--advertise-refs", ".").RunStdBytes(&git.RunOpts{Env: h.environ, Dir: h.dir})
refs, _, err := cmd.AddArguments("--stateless-rpc", "--advertise-refs", ".").RunStdBytes(&git.RunOpts{Env: h.environ, Dir: h.dir})
if err != nil {
log.Error(fmt.Sprintf("%v - %s", err, string(refs)))
}