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net: Push capable(CAP_NET_ADMIN) into the rtnl methods

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- In rtnetlink_rcv_msg convert the capable(CAP_NET_ADMIN) check
  to ns_capable(net->user-ns, CAP_NET_ADMIN).  Allowing unprivileged
  users to make netlink calls to modify their local network
  namespace.

- In the rtnetlink doit methods add capable(CAP_NET_ADMIN) so
  that calls that are not safe for unprivileged users are still
  protected.

Later patches will remove the extra capable calls from methods
that are safe for unprivilged users.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2012-11-16 03:03:00 +00:00 • committed by David S. Miller
parent 464dc801c7
commit dfc47ef863
17 changed files with 102 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

6
net/ipv4/devinet.c
View file

@ -539,6 +539,9 @@ static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg
ASSERT_RTNL();
if (!capable(CAP_NET_ADMIN))
return -EPERM;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
if (err < 0)
goto errout;
@ -646,6 +649,9 @@ static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg
ASSERT_RTNL();
if (!capable(CAP_NET_ADMIN))
return -EPERM;
ifa = rtm_to_ifaddr(net, nlh);
if (IS_ERR(ifa))
return PTR_ERR(ifa);