From 119d04f017c39307280bb88fcdeaaf6f31ee9c9d Mon Sep 17 00:00:00 2001
From: Helmut Grohne <helmut@subdivi.de>
Date: Fri, 19 Jan 2024 13:08:41 +0100
Subject: add convenience function unshare_user_idmap_nohelper

---
 linuxnamespaces/__init__.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'linuxnamespaces/__init__.py')

diff --git a/linuxnamespaces/__init__.py b/linuxnamespaces/__init__.py
index 29d41f6..5d810b0 100644
--- a/linuxnamespaces/__init__.py
+++ b/linuxnamespaces/__init__.py
@@ -331,3 +331,16 @@ def unshare_user_idmap(
         newidmaps(pid, uidmap, gidmap)
     unshare(flags)
     setup_idmaps()
+
+def unshare_user_idmap_nohelper(
+    uid: int, gid: int, flags: CloneFlags = CloneFlags.NEWUSER
+) -> None:
+    """Unshare the given namespaces (must include user) and
+    map the current user and group to the given uid and gid
+    without using the setuid helpers.
+    """
+    uidmap = IDMapping(uid, os.getuid(), 1)
+    gidmap = IDMapping(gid, os.getgid(), 1)
+    unshare(flags)
+    pathlib.Path("/proc/self/setgroups").write_bytes(b"deny")
+    newidmaps(-1, [uidmap], [gidmap], False)
-- 
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