fix potential ssrf attack in AUTOMATIC1111#12663

modules/api/api.py

@@ -4,6 +4,8 @@
 import time
 import datetime
 import uvicorn
+import ipaddress
+import requests
 import gradio as gr
 from threading import Lock
 from io import BytesIO
@@ -56,8 +58,27 @@ def setUpscalers(req: dict):
 
 
 def decode_base64_to_image(encoding):
+    def verify_url(url):
+        import socket
+        from urllib.parse import urlparse
+        try:
+            parsed_url = urlparse(url)
+            domain_name = parsed_url.netloc
+            host = socket.gethostbyname_ex(domain_name)
+            for ip in host[2]:
+                ip_addr = ipaddress.ip_address(ip)
+                # https://docs.python.org/3/library/ipaddress.html#ipaddress.IPv4Address.is_global
+                if not ip_addr.is_global:
+                    return False
+        except Exception:
+            return False
+
+        return True
+
     if encoding.startswith("http://") or encoding.startswith("https://"):
-        import requests
+        if not verify_url(encoding):
+            raise HTTPException(status_code=500, detail="Invalid image url")
+
         response = requests.get(encoding, timeout=30, headers={'user-agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36'})
         try:
             image = Image.open(BytesIO(response.content))