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Fix panic in storageHandler (#27446)

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storageHandler() is written as a middleware but is used as an endpoint
handler, and thus `next` is actually `nil`, which causes a null pointer
dereference when a request URL does not match the pattern (where it
calls `next.ServerHTTP()`).

Example CURL command to trigger the panic:

```
curl -I "http://yourhost/gitea//avatars/a"
```

Fixes #27409

---

Note: the diff looks big but it's actually a small change - all I did
was to remove the outer closure (and one level of indentation) ~and
removed the HTTP method and pattern checks as they seem redundant
because go-chi already does those checks~. You might want to check "Hide
whitespace" when reviewing it.

Alternative solution (a bit simpler): append `, misc.DummyOK` to the
route declarations that utilize `storageHandler()` - this makes it
return an empty response when the URL is invalid. I've tested this one
and it works too. Or maybe it would be better to return a 400 error in
that case (?)
This commit is contained in:
Sergey Zolotarev 2023-10-06 13:23:14 +00:00 • committed by GitHub
parent 023e937141
commit 7b79be24ca
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1 changed files with 50 additions and 51 deletions
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101
routers/web/base.go
View file

@ -19,81 +19,80 @@ import (
"code.gitea.io/gitea/modules/web/routing"
)
func storageHandler(storageSetting *setting.Storage, prefix string, objStore storage.ObjectStorage) func(next http.Handler) http.Handler {
func storageHandler(storageSetting *setting.Storage, prefix string, objStore storage.ObjectStorage) http.HandlerFunc {
prefix = strings.Trim(prefix, "/")
funcInfo := routing.GetFuncInfo(storageHandler, prefix)
return func(next http.Handler) http.Handler {
if storageSetting.MinioConfig.ServeDirect {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
if req.Method != "GET" && req.Method != "HEAD" {
next.ServeHTTP(w, req)
return
}
if !strings.HasPrefix(req.URL.Path, "/"+prefix+"/") {
next.ServeHTTP(w, req)
return
}
routing.UpdateFuncInfo(req.Context(), funcInfo)
rPath := strings.TrimPrefix(req.URL.Path, "/"+prefix+"/")
rPath = util.PathJoinRelX(rPath)
u, err := objStore.URL(rPath, path.Base(rPath))
if err != nil {
if os.IsNotExist(err) || errors.Is(err, os.ErrNotExist) {
log.Warn("Unable to find %s %s", prefix, rPath)
http.Error(w, "file not found", http.StatusNotFound)
return
}
log.Error("Error whilst getting URL for %s %s. Error: %v", prefix, rPath, err)
http.Error(w, fmt.Sprintf("Error whilst getting URL for %s %s", prefix, rPath), http.StatusInternalServerError)
return
}
http.Redirect(w, req, u.String(), http.StatusTemporaryRedirect)
})
}
if storageSetting.MinioConfig.ServeDirect {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
if req.Method != "GET" && req.Method != "HEAD" {
next.ServeHTTP(w, req)
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if !strings.HasPrefix(req.URL.Path, "/"+prefix+"/") {
next.ServeHTTP(w, req)
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
routing.UpdateFuncInfo(req.Context(), funcInfo)
rPath := strings.TrimPrefix(req.URL.Path, "/"+prefix+"/")
rPath = util.PathJoinRelX(rPath)
if rPath == "" || rPath == "." {
http.Error(w, "file not found", http.StatusNotFound)
return
}
fi, err := objStore.Stat(rPath)
u, err := objStore.URL(rPath, path.Base(rPath))
if err != nil {
if os.IsNotExist(err) || errors.Is(err, os.ErrNotExist) {
log.Warn("Unable to find %s %s", prefix, rPath)
http.Error(w, "file not found", http.StatusNotFound)
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
log.Error("Error whilst opening %s %s. Error: %v", prefix, rPath, err)
http.Error(w, fmt.Sprintf("Error whilst opening %s %s", prefix, rPath), http.StatusInternalServerError)
log.Error("Error whilst getting URL for %s %s. Error: %v", prefix, rPath, err)
http.Error(w, fmt.Sprintf("Error whilst getting URL for %s %s", prefix, rPath), http.StatusInternalServerError)
return
}
fr, err := objStore.Open(rPath)
if err != nil {
log.Error("Error whilst opening %s %s. Error: %v", prefix, rPath, err)
http.Error(w, fmt.Sprintf("Error whilst opening %s %s", prefix, rPath), http.StatusInternalServerError)
return
}
defer fr.Close()
httpcache.ServeContentWithCacheControl(w, req, path.Base(rPath), fi.ModTime(), fr)
http.Redirect(w, req, u.String(), http.StatusTemporaryRedirect)
})
}
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
if req.Method != "GET" && req.Method != "HEAD" {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if !strings.HasPrefix(req.URL.Path, "/"+prefix+"/") {
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
routing.UpdateFuncInfo(req.Context(), funcInfo)
rPath := strings.TrimPrefix(req.URL.Path, "/"+prefix+"/")
rPath = util.PathJoinRelX(rPath)
if rPath == "" || rPath == "." {
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
fi, err := objStore.Stat(rPath)
if err != nil {
if os.IsNotExist(err) || errors.Is(err, os.ErrNotExist) {
log.Warn("Unable to find %s %s", prefix, rPath)
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
log.Error("Error whilst opening %s %s. Error: %v", prefix, rPath, err)
http.Error(w, fmt.Sprintf("Error whilst opening %s %s", prefix, rPath), http.StatusInternalServerError)
return
}
fr, err := objStore.Open(rPath)
if err != nil {
log.Error("Error whilst opening %s %s. Error: %v", prefix, rPath, err)
http.Error(w, fmt.Sprintf("Error whilst opening %s %s", prefix, rPath), http.StatusInternalServerError)
return
}
defer fr.Close()
httpcache.ServeContentWithCacheControl(w, req, path.Base(rPath), fi.ModTime(), fr)
})
}