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>
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 49e1493..65429b9 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -240,9 +240,6 @@
struct nlattr *tb[IFLA_BRPORT_MAX];
int err;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
ifm = nlmsg_data(nlh);
protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index bf5b5b8..58a4ba2 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -275,9 +275,6 @@
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 @@
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 7adcdaf..f1c0c2e 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1620,9 +1620,6 @@
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 @@
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 @@
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 a40c10b..575a6ee 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1316,6 +1316,10 @@
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 @@
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 @@
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 @@
struct nlattr *linkinfo[IFLA_INFO_MAX+1];
int err;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
#ifdef CONFIG_MODULES
replay:
#endif
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 298c1c2..e13183a 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -539,9 +539,6 @@
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;
@@ -649,9 +646,6 @@
ASSERT_RTNL();
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
ifa = rtm_to_ifaddr(net, nlh);
if (IS_ERR(ifa))
return PTR_ERR(ifa);
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 784716a..5cd75e2 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -613,9 +613,6 @@
struct fib_table *tb;
int err;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
err = rtm_to_fib_config(net, skb, nlh, &cfg);
if (err < 0)
goto errout;
@@ -638,9 +635,6 @@
struct fib_table *tb;
int err;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
err = rtm_to_fib_config(net, skb, nlh, &cfg);
if (err < 0)
goto errout;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index d39fe49..fc0e13a 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3514,9 +3514,6 @@
struct in6_addr *pfx;
int err;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
if (err < 0)
return err;
@@ -3587,9 +3584,6 @@
u8 ifa_flags;
int err;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
if (err < 0)
return err;
diff --git a/net/ipv6/addrlabel.c b/net/ipv6/addrlabel.c
index b106f80..ff76eec 100644
--- a/net/ipv6/addrlabel.c
+++ b/net/ipv6/addrlabel.c
@@ -425,9 +425,6 @@
u32 label;
int err = 0;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
if (err < 0)
return err;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a86b655..8f124f5 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2446,9 +2446,6 @@
struct fib6_config cfg;
int err;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
err = rtm_to_fib6_config(skb, nlh, &cfg);
if (err < 0)
return err;
@@ -2464,9 +2461,6 @@
struct fib6_config cfg;
int err;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
err = rtm_to_fib6_config(skb, nlh, &cfg);
if (err < 0)
return err;
