Files
s3/weed/s3api/s3api_path_validation.go
zooqueen dd74d3e6d6 Replace AGPL MinIO fork with Apache-2.0 SeaweedFS fork; rebrand CLI weed->s3
hanzoai/s3 was an AGPL-3.0 MinIO fork whose network-copyleft blocks embedding
and reselling as a managed service. Replace it wholesale with a fork of
SeaweedFS (github.com/seaweedfs/seaweedfs, Apache-2.0, Go) which ships a
built-in S3 gateway + Filer.

- License: AGPL-3.0 -> Apache-2.0 (upstream LICENSE kept verbatim, incl.
  "Copyright 2025 Chris Lu"); NOTICE added crediting SeaweedFS. No AGPL/BUSL/
  SSPL/GPL or enterprise ("ee") files remain.
- Module: go.mod path set to github.com/hanzoai/s3 with a self-replace
  (replace github.com/seaweedfs/seaweedfs => ./) so the ~1800 internal Go files
  keep their upstream import paths with zero churn. Internal identifiers and
  import paths are intentionally NOT renamed.
- CLI rebrand: the binary is built as `s3` (was `weed`); root usage, per-command
  help/usage/flag strings, shell autocomplete program name, and the product name
  in CLI output now read "Hanzo S3" / `s3`. Users never see `weed`.
  (e.g. `s3 server`, `s3 filer`, `s3 master`, `s3 volume`, `s3 s3`, `s3 mount`.)
- Build: `make` (or `go build -o s3 ./weed`) builds the `s3` binary green;
  `cmd/weed-db` and `cmd/weed-sql` also build; `go vet ./weed/command/` clean.
- README/LLM.md rewritten for Hanzo S3; AGENTS.md/CLAUDE.md symlinks preserved.
- Dropped a 33MB prebuilt Mach-O `stress` binary upstream had committed; `.gitignore`
  updated to ignore the `s3` build output.
2026-06-18 23:41:25 -07:00

88 lines
2.6 KiB
Go

package s3api
import (
"net/http"
"net/url"
"strings"
"github.com/gorilla/mux"
"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
"github.com/seaweedfs/seaweedfs/weed/s3api/s3err"
)
func hasPathSegmentQuery(rawQuery string) bool {
if strings.Contains(rawQuery, "versionId") || strings.Contains(rawQuery, "uploadId") {
return true
}
if !strings.Contains(rawQuery, "%") {
return false
}
for rawQuery != "" {
field := rawQuery
if i := strings.IndexByte(rawQuery, '&'); i >= 0 {
field, rawQuery = rawQuery[:i], rawQuery[i+1:]
} else {
rawQuery = ""
}
if i := strings.IndexByte(field, '='); i >= 0 {
field = field[:i]
}
if !strings.Contains(field, "%") {
continue
}
key, err := url.QueryUnescape(field)
if err == nil && (key == "versionId" || key == "uploadId") {
return true
}
}
return false
}
func hasInvalidPathSegment(values []string) bool {
for _, value := range values {
if value != "" && !s3_constants.IsValidPathSegment(value) {
return true
}
}
return false
}
// validateRequestPath rejects requests whose captured {bucket}/{object} mux
// vars would normalize to a parent-directory traversal once joined into a
// filer path. The router runs with mux.NewRouter().SkipClean(true), so
// segments like `..` survive routing; the filer's util.JoinPath later collapses
// them via filepath.Join. Without this guard, `GET /bucket-A/../evil-bucket/k`
// matches as bucket=bucket-A, object=../evil-bucket/k, the filer resolves the
// read against evil-bucket, while IAM authorizes against bucket-A.
func validateRequestPath(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
// When a var is in the matched route it must be non-empty: an empty
// bucket would let downstream path.Join collapse it and let the object
// key pick the bucket.
if bucket, ok := vars["bucket"]; ok {
if bucket == "" || !s3_constants.IsValidBucketName(bucket) {
s3err.WriteErrorResponse(w, r, s3err.ErrInvalidRequest)
return
}
}
if object, ok := vars["object"]; ok {
if object == "" || !s3_constants.IsValidObjectKey(object) {
s3err.WriteErrorResponse(w, r, s3err.ErrInvalidRequest)
return
}
}
// versionId and uploadId are later used as filer entry names. Avoid
// parsing every request's query while still recognizing encoded names.
if hasPathSegmentQuery(r.URL.RawQuery) {
query := r.URL.Query()
if hasInvalidPathSegment(query["versionId"]) || hasInvalidPathSegment(query["uploadId"]) {
s3err.WriteErrorResponse(w, r, s3err.ErrInvalidRequest)
return
}
}
next.ServeHTTP(w, r)
})
}