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net: Enable a userns root rtnl calls that are safe for unprivilged users

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- 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>
This commit is contained in:
Eric W. Biederman 2012-11-16 03:03:11 +00:00 committed by David S. Miller
parent c027aab4a6
commit b51642f6d7
9 changed files with 4 additions and 54 deletions
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3
net/bridge/br_netlink.c
View File

@ -240,9 +240,6 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
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);

6
net/core/fib_rules.c
View File

@ -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;

9
net/core/neighbour.c
View File

@ -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)

13
net/core/rtnetlink.c
View File

@ -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

6
net/ipv4/devinet.c
View File

@ -539,9 +539,6 @@ 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;
@ -649,9 +646,6 @@ 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);

6
net/ipv4/fib_frontend.c
View File

@ -613,9 +613,6 @@ static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *ar
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 @@ static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *ar
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;

6
net/ipv6/addrconf.c
View File

@ -3514,9 +3514,6 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
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 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
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;

3
net/ipv6/addrlabel.c
View File

@ -425,9 +425,6 @@ static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,
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;

6
net/ipv6/route.c
View File

@ -2446,9 +2446,6 @@ static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *a
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 @@ static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *a
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;