SameSite=Strict as default; closes #189

copyparty/__main__.py

@@ -1288,6 +1288,7 @@ def add_stats(ap):
 def add_yolo(ap):
     ap2 = ap.add_argument_group('yolo options')
     ap2.add_argument("--allow-csrf", action="store_true", help="disable csrf protections; let other domains/sites impersonate you through cross-site requests")
+    ap2.add_argument("--cookie-lax", action="store_true", help="allow cookies from other domains (if you follow a link from another website into your server, you will arrive logged-in); this reduces protection against CSRF")
     ap2.add_argument("--getmod", action="store_true", help="permit ?move=[...] and ?delete as GET")
     ap2.add_argument("--wo-up-readme", action="store_true", help="allow users with write-only access to upload logues and readmes without adding the _wo_ filename prefix (volflag=wo_up_readme)")
 

copyparty/httpcli.py

@@ -2995,12 +2995,20 @@ class HttpCli(object):
             # reset both plaintext and tls
             # (only affects active tls cookies when tls)
             for k in ("cppwd", "cppws") if self.is_https else ("cppwd",):
-                ck = gencookie(k, pwd, self.args.R, False)
+                ck = gencookie(k, pwd, self.args.R, self.args.cookie_lax, False)
                 self.out_headerlist.append(("Set-Cookie", ck))
             self.out_headers.pop("Set-Cookie", None)  # drop keepalive
         else:
             k = "cppws" if self.is_https else "cppwd"
-            ck = gencookie(k, pwd, self.args.R, self.is_https, dur, "; HttpOnly")
+            ck = gencookie(
+                k,
+                pwd,
+                self.args.R,
+                self.args.cookie_lax,
+                self.is_https,
+                dur,
+                "; HttpOnly",
+            )
             self.out_headers["Set-Cookie"] = ck
 
         return dur > 0, msg
@@ -5041,7 +5049,7 @@ class HttpCli(object):
     def setck(self) -> bool:
         k, v = self.uparam["setck"].split("=", 1)
         t = 0 if v in ("", "x") else 86400 * 299
-        ck = gencookie(k, v, self.args.R, False, t)
+        ck = gencookie(k, v, self.args.R, self.args.cookie_lax, False, t)
         self.out_headerlist.append(("Set-Cookie", ck))
         if "cc" in self.ouparam:
             self.redirect("", "?h#cc")
@@ -5053,7 +5061,7 @@ class HttpCli(object):
         for k in ALL_COOKIES:
             if k not in self.cookies:
                 continue
-            cookie = gencookie(k, "x", self.args.R, False)
+            cookie = gencookie(k, "x", self.args.R, self.args.cookie_lax, False)
             self.out_headerlist.append(("Set-Cookie", cookie))
 
         self.redirect("", "?h#cc")

copyparty/util.py

@@ -2037,15 +2037,25 @@ def formatdate(ts: Optional[float] = None) -> str:
     return RFC2822 % (WKDAYS[wd], d, MONTHS[mo - 1], y, h, mi, s)
 
 
-def gencookie(k: str, v: str, r: str, tls: bool, dur: int = 0, txt: str = "") -> str:
+def gencookie(
+    k: str, v: str, r: str, lax: bool, tls: bool, dur: int = 0, txt: str = ""
+) -> str:
     v = v.replace("%", "%25").replace(";", "%3B")
     if dur:
         exp = formatdate(time.time() + dur)
     else:
         exp = "Fri, 15 Aug 1997 01:00:00 GMT"
 
-    t = "%s=%s; Path=/%s; Expires=%s%s%s; SameSite=Lax"
-    return t % (k, v, r, exp, "; Secure" if tls else "", txt)
+    t = "%s=%s; Path=/%s; Expires=%s%s%s; SameSite=%s"
+    return t % (
+        k,
+        v,
+        r,
+        exp,
+        "; Secure" if tls else "",
+        txt,
+        "Lax" if lax else "Strict",
+    )
 
 
 def humansize(sz: float, terse: bool = False) -> str:

tests/util.py

@@ -143,7 +143,7 @@ class Cfg(Namespace):
     def __init__(self, a=None, v=None, c=None, **ka0):
         ka = {}
 
-        ex = "chpw daw dav_auth dav_mac dav_rt e2d e2ds e2dsa e2t e2ts e2tsr e2v e2vu e2vp early_ban ed emp exp force_js getmod grid gsel hardlink hardlink_only ih ihead magic nid nih no_acode no_athumb no_bauth no_clone no_cp no_dav no_db_ip no_del no_dirsz no_dupe no_lifetime no_logues no_mv no_pipe no_poll no_readme no_robots no_sb_md no_sb_lg no_scandir no_tail no_tarcmp no_thumb no_vthumb no_zip nrand nsort nw og og_no_head og_s_title ohead q rand re_dirsz rmagic rss smb srch_dbg srch_excl stats uqe vague_403 vc ver wo_up_readme write_uplog xdev xlink xvol zipmaxu zs"
+        ex = "chpw cookie_lax daw dav_auth dav_mac dav_rt e2d e2ds e2dsa e2t e2ts e2tsr e2v e2vu e2vp early_ban ed emp exp force_js getmod grid gsel hardlink hardlink_only ih ihead magic nid nih no_acode no_athumb no_bauth no_clone no_cp no_dav no_db_ip no_del no_dirsz no_dupe no_lifetime no_logues no_mv no_pipe no_poll no_readme no_robots no_sb_md no_sb_lg no_scandir no_tail no_tarcmp no_thumb no_vthumb no_zip nrand nsort nw og og_no_head og_s_title ohead q rand re_dirsz rmagic rss smb srch_dbg srch_excl stats uqe vague_403 vc ver wo_up_readme write_uplog xdev xlink xvol zipmaxu zs"
         ka.update(**{k: False for k in ex.split()})
 
         ex = "dav_inf dedup dotpart dotsrch hook_v no_dhash no_fastboot no_fpool no_htp no_rescan no_sendfile no_ses no_snap no_up_list no_voldump re_dhash see_dots plain_ip"