Security Nice-to-Have: Dockerfile, Magic-Bytes, Path-Traversal, TABLE_MAP, Deps

- Dockerfile: non-root user appuser, chown /data + /app
- media_utils: validate_upload() Magic-Byte-Check (JPEG/PNG/GIF/WebP/MP4/WebM)
- media_utils: safe_media_path() Path-Traversal-Schutz beim Löschen
- diary/health/dogs: safe_media_path() statt os.path.join + lstrip
- diary: validate_upload() vor jedem Medien-Upload
- forum: _LIKE_TABLE dict statt dynamischer String-Interpolation
- requirements: uvicorn 0.34, PyJWT 2.10.1, pydantic 2.10.6, bcrypt 4.3, httpx 0.28.1, anthropic 0.49
- SW by-v319, APP_VER 307

backend/routes/diary.py

@@ -8,7 +8,7 @@ from database import db
 from auth import get_current_user
 import ki as KI
 import httpx
-from media_utils import convert_media, extract_video_thumb
+from media_utils import convert_media, extract_video_thumb, safe_media_path, validate_upload
 
 router    = APIRouter()
 MEDIA_DIR = os.getenv("MEDIA_DIR", "/data/media")
@@ -488,6 +488,10 @@ async def upload_media(dog_id: int, entry_id: int,
             raise HTTPException(415, "Nur Bilder, Videos und PDFs erlaubt.")
 
     raw_data   = await file.read()
+    try:
+        validate_upload(raw_data, file.filename or "")
+    except ValueError as e:
+        raise HTTPException(415, str(e))
     raw_data, ext = convert_media(raw_data, file.filename or "")
     if not ext:
         ext = ".jpg"
@@ -539,9 +543,10 @@ async def delete_media_item(dog_id: int, entry_id: int, media_id: int,
         ).fetchone()
         if not row:
             raise HTTPException(404, "Medium nicht gefunden.")
-        file_path = os.path.join(MEDIA_DIR, row["url"].lstrip("/media/"))
-        try: os.remove(file_path)
-        except OSError: pass
+        file_path = safe_media_path(MEDIA_DIR, row["url"])
+        if file_path:
+            try: os.remove(file_path)
+            except OSError: pass
         conn.execute("DELETE FROM diary_media WHERE id=?", (media_id,))
 
 
@@ -556,9 +561,10 @@ async def delete_media_legacy(dog_id: int, entry_id: int, user=Depends(get_curre
         if not row:
             raise HTTPException(404, "Eintrag nicht gefunden.")
         if row["media_url"]:
-            path = os.path.join(MEDIA_DIR, row["media_url"].lstrip("/media/"))
-            try: os.remove(path)
-            except OSError: pass
+            path = safe_media_path(MEDIA_DIR, row["media_url"])
+            if path:
+                try: os.remove(path)
+                except OSError: pass
         conn.execute("UPDATE diary SET media_url=NULL WHERE id=?", (entry_id,))
 
 

backend/routes/dogs.py

@@ -8,6 +8,7 @@ from typing import Optional
 from database import db
 from auth import get_current_user
 from routes.push import send_push_to_user
+from media_utils import safe_media_path
 
 router    = APIRouter()
 MEDIA_DIR = os.getenv("MEDIA_DIR", "/data/media")
@@ -208,8 +209,8 @@ async def delete_photo(dog_id: int, user=Depends(get_current_user)):
     if not row:
         raise HTTPException(404, "Hund nicht gefunden.")
     if row["foto_url"]:
-        path = os.path.join(MEDIA_DIR, row["foto_url"].lstrip("/media/"))
-        if os.path.exists(path):
+        path = safe_media_path(MEDIA_DIR, row["foto_url"])
+        if path and os.path.exists(path):
             os.remove(path)
     with db() as conn:
         conn.execute(

backend/routes/forum.py

@@ -476,12 +476,14 @@ async def upload_post_foto(
 # ------------------------------------------------------------------
 # POST /api/forum/like — Toggle
 # ------------------------------------------------------------------
+_LIKE_TABLE = {'thread': 'forum_threads', 'post': 'forum_posts'}
+
 @router.post("/like")
 async def toggle_like(data: LikeBody, user=Depends(get_current_user)):
-    if data.target_type not in ('thread', 'post'):
+    if data.target_type not in _LIKE_TABLE:
         raise HTTPException(400, "Ungültiger Typ.")
 
-    table = f"forum_{data.target_type}s"
+    table = _LIKE_TABLE[data.target_type]
     with db() as conn:
         existing = conn.execute(
             "SELECT 1 FROM forum_likes WHERE user_id=? AND target_type=? AND target_id=?",

backend/routes/health.py

@@ -7,6 +7,7 @@ from pydantic import BaseModel
 from typing import Optional
 from database import db
 from auth import get_current_user
+from media_utils import safe_media_path
 
 router    = APIRouter()
 MEDIA_DIR = os.getenv("MEDIA_DIR", "/data/media")
@@ -219,10 +220,8 @@ async def delete_dokument(dog_id: int, entry_id: int, user=Depends(get_current_u
 
         datei_url = entry["datei_url"]
         if datei_url:
-            # datei_url z.B. "/media/health/health_42_abc12345.pdf"
-            filename = datei_url.lstrip("/media/")
-            path = os.path.join(MEDIA_DIR, filename)
-            if os.path.isfile(path):
+            path = safe_media_path(MEDIA_DIR, datei_url)
+            if path and os.path.isfile(path):
                 os.remove(path)
 
         conn.execute(
@@ -338,9 +337,10 @@ async def delete_media_item(dog_id: int, entry_id: int, media_id: int,
         ).fetchone()
         if not row:
             raise HTTPException(404, "Medium nicht gefunden.")
-        file_path = os.path.join(MEDIA_DIR, row["url"].lstrip("/media/"))
-        try: os.remove(file_path)
-        except OSError: pass
+        file_path = safe_media_path(MEDIA_DIR, row["url"])
+        if file_path:
+            try: os.remove(file_path)
+            except OSError: pass
         conn.execute("DELETE FROM health_media WHERE id=?", (media_id,))