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authorDavid Woodhouse <dwmw2@infradead.org>2006-06-22 16:07:52 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-06-23 02:07:44 -0700
commitca6bb5d7ab22ac79f608fe6cbc6b12de6a5a19f0 (patch)
tree7255df98fa5692c498605d2bd80402ec866f134a /Documentation
parentf4b8ea7849544114e9d3d682df4d400180854677 (diff)
downloadop-kernel-dev-ca6bb5d7ab22ac79f608fe6cbc6b12de6a5a19f0.zip
op-kernel-dev-ca6bb5d7ab22ac79f608fe6cbc6b12de6a5a19f0.tar.gz
[NET]: Require CAP_NET_ADMIN to create tuntap devices.
The tuntap driver allows an admin to create persistent devices and assign ownership of them to individual users. Unfortunately, relaxing the permissions on the /dev/net/tun device node so that they can actually use those devices will _also_ allow those users to create arbitrary new devices of their own. This patch corrects that, and adjusts the recommended permissions for the device node accordingly. Signed-off-By: David Woodhouse <dwmw2@infradead.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/networking/tuntap.txt11
1 files changed, 7 insertions, 4 deletions
diff --git a/Documentation/networking/tuntap.txt b/Documentation/networking/tuntap.txt
index 76750fb..839cbb7 100644
--- a/Documentation/networking/tuntap.txt
+++ b/Documentation/networking/tuntap.txt
@@ -39,10 +39,13 @@ Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
mknod /dev/net/tun c 10 200
Set permissions:
- e.g. chmod 0700 /dev/net/tun
- if you want the device only accessible by root. Giving regular users the
- right to assign network devices is NOT a good idea. Users could assign
- bogus network interfaces to trick firewalls or administrators.
+ e.g. chmod 0666 /dev/net/tun
+ There's no harm in allowing the device to be accessible by non-root users,
+ since CAP_NET_ADMIN is required for creating network devices or for
+ connecting to network devices which aren't owned by the user in question.
+ If you want to create persistent devices and give ownership of them to
+ unprivileged users, then you need the /dev/net/tun device to be usable by
+ those users.
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