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authorEric W. Biederman <ebiederm@xmission.com>2012-11-16 07:03:11 +0400
committerDavid S. Miller <davem@davemloft.net>2012-11-19 05:33:36 +0400
commitb51642f6d77b131dc85d1d71029c3cbb5b07c262 (patch)
tree0f3feb16dad1cd729dff368396ee90cd424797a1 /net/core
parentc027aab4a6b1fe2541090ac04bee8ad246aeef70 (diff)
downloadlinux-b51642f6d77b131dc85d1d71029c3cbb5b07c262.tar.xz
net: Enable a userns root rtnl calls that are safe for unprivilged users
- Only allow moving network devices to network namespaces you have CAP_NET_ADMIN privileges over. - Enable creating/deleting/modifying interfaces - Enable adding/deleting addresses - Enable adding/setting/deleting neighbour entries - Enable adding/removing routes - Enable adding/removing fib rules - Enable setting the forwarding state - Enable adding/removing ipv6 address labels - Enable setting bridge parameter Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/fib_rules.c6
-rw-r--r--net/core/neighbour.c9
-rw-r--r--net/core/rtnetlink.c13
3 files changed, 4 insertions, 24 deletions
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index bf5b5b8af56e..58a4ba27dfe3 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -275,9 +275,6 @@ static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
struct nlattr *tb[FRA_MAX+1];
int err = -EINVAL, unresolved = 0;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
goto errout;
@@ -427,9 +424,6 @@ static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
struct nlattr *tb[FRA_MAX+1];
int err = -EINVAL;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
goto errout;
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 7adcdaf91c4d..f1c0c2e9cad5 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1620,9 +1620,6 @@ static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
struct net_device *dev = NULL;
int err = -EINVAL;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
ASSERT_RTNL();
if (nlmsg_len(nlh) < sizeof(*ndm))
goto out;
@@ -1687,9 +1684,6 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
struct net_device *dev = NULL;
int err;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
ASSERT_RTNL();
err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
if (err < 0)
@@ -1968,9 +1962,6 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
struct nlattr *tb[NDTA_MAX+1];
int err;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX,
nl_neightbl_policy);
if (err < 0)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a40c10b96f47..575a6ee89944 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1316,6 +1316,10 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
err = PTR_ERR(net);
goto errout;
}
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
+ err = -EPERM;
+ goto errout;
+ }
err = dev_change_net_namespace(dev, net, ifname);
put_net(net);
if (err)
@@ -1547,9 +1551,6 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
struct nlattr *tb[IFLA_MAX+1];
char ifname[IFNAMSIZ];
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
if (err < 0)
goto errout;
@@ -1593,9 +1594,6 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
int err;
LIST_HEAD(list_kill);
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
if (err < 0)
return err;
@@ -1726,9 +1724,6 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
struct nlattr *linkinfo[IFLA_INFO_MAX+1];
int err;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
#ifdef CONFIG_MODULES
replay:
#endif