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net: Allow userns root to control ipv6 

Allow an unpriviled user who has created a user namespace, and then
created a network namespace to effectively use the new network
namespace, by reducing capable(CAP_NET_ADMIN) and
capable(CAP_NET_RAW) calls to be ns_capable(net->user_ns,
CAP_NET_ADMIN), or capable(net->user_ns, CAP_NET_RAW) calls.

Settings that merely control a single network device are allowed.
Either the network device is a logical network device where
restrictions make no difference or the network device is hardware NIC
that has been explicity moved from the initial network namespace.

In general policy and network stack state changes are allowed while
resource control is left unchanged.

Allow the SIOCSIFADDR ioctl to add ipv6 addresses.
Allow the SIOCDIFADDR ioctl to delete ipv6 addresses.
Allow the SIOCADDRT ioctl to add ipv6 routes.
Allow the SIOCDELRT ioctl to delete ipv6 routes.

Allow creation of ipv6 raw sockets.

Allow setting the IPV6_JOIN_ANYCAST socket option.
Allow setting the IPV6_FL_A_RENEW parameter of the IPV6_FLOWLABEL_MGR
socket option.

Allow setting the IPV6_TRANSPARENT socket option.
Allow setting the IPV6_HOPOPTS socket option.
Allow setting the IPV6_RTHDRDSTOPTS socket option.
Allow setting the IPV6_DSTOPTS socket option.
Allow setting the IPV6_IPSEC_POLICY socket option.
Allow setting the IPV6_XFRM_POLICY socket option.

Allow sending packets with the IPV6_2292HOPOPTS control message.
Allow sending packets with the IPV6_2292DSTOPTS control message.
Allow sending packets with the IPV6_RTHDRDSTOPTS control message.

Allow setting the multicast routing socket options on non multicast
routing sockets.

Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL, and SIOCDELTUNNEL ioctls for
setting up, changing and deleting tunnels over ipv6.

Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL, SIOCDELTUNNEL ioctls for
setting up, changing and deleting ipv6 over ipv4 tunnels.

Allow the SIOCADDPRL, SIOCDELPRL, SIOCCHGPRL ioctls for adding,
deleting, and changing the potential router list for ISATAP tunnels.

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 03:03:06 +00:00 committed by David S. Miller
parent 52e804c6df
commit af31f412c7
12 changed files with 28 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
net/ipv6/addrconf.c
View File

@ -2413,7 +2413,7 @@ int addrconf_add_ifaddr(struct net *net, void __user *arg)
struct in6_ifreq ireq; struct in6_ifreq ireq;
int err; int err;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM; return -EPERM;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
@ -2432,7 +2432,7 @@ int addrconf_del_ifaddr(struct net *net, void __user *arg)
struct in6_ifreq ireq; struct in6_ifreq ireq;
int err; int err;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM; return -EPERM;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))

3
net/ipv6/af_inet6.c
View File

@ -160,7 +160,8 @@ lookup_protocol:
} }
err = -EPERM; err = -EPERM;
if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) if (sock->type == SOCK_RAW && !kern &&
!ns_capable(net->user_ns, CAP_NET_RAW))
goto out_rcu_unlock; goto out_rcu_unlock;
sock->ops = answer->ops; sock->ops = answer->ops;

2
net/ipv6/anycast.c
View File

@ -64,7 +64,7 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
int ishost = !net->ipv6.devconf_all->forwarding; int ishost = !net->ipv6.devconf_all->forwarding;
int err = 0; int err = 0;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM; return -EPERM;
if (ipv6_addr_is_multicast(addr)) if (ipv6_addr_is_multicast(addr))
return -EINVAL; return -EINVAL;

6
net/ipv6/datagram.c
View File

@ -701,7 +701,7 @@ int datagram_send_ctl(struct net *net, struct sock *sk,
err = -EINVAL; err = -EINVAL;
goto exit_f; goto exit_f;
} }
if (!capable(CAP_NET_RAW)) { if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
err = -EPERM; err = -EPERM;
goto exit_f; goto exit_f;
} }
@ -721,7 +721,7 @@ int datagram_send_ctl(struct net *net, struct sock *sk,
err = -EINVAL; err = -EINVAL;
goto exit_f; goto exit_f;
} }
if (!capable(CAP_NET_RAW)) { if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
err = -EPERM; err = -EPERM;
goto exit_f; goto exit_f;
} }
@ -746,7 +746,7 @@ int datagram_send_ctl(struct net *net, struct sock *sk,
err = -EINVAL; err = -EINVAL;
goto exit_f; goto exit_f;
} }
if (!capable(CAP_NET_RAW)) { if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
err = -EPERM; err = -EPERM;
goto exit_f; goto exit_f;
} }

3
net/ipv6/ip6_flowlabel.c
View File

@ -519,7 +519,8 @@ int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
} }
read_unlock_bh(&ip6_sk_fl_lock); read_unlock_bh(&ip6_sk_fl_lock);
if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) { if (freq.flr_share == IPV6_FL_S_NONE &&
ns_capable(net->user_ns, CAP_NET_ADMIN)) {
fl = fl_lookup(net, freq.flr_label); fl = fl_lookup(net, freq.flr_label);
if (fl) { if (fl) {
err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);

4
net/ipv6/ip6_gre.c
View File

@ -1146,7 +1146,7 @@ static int ip6gre_tunnel_ioctl(struct net_device *dev,
case SIOCADDTUNNEL: case SIOCADDTUNNEL:
case SIOCCHGTUNNEL: case SIOCCHGTUNNEL:
err = -EPERM; err = -EPERM;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto done; goto done;
err = -EFAULT; err = -EFAULT;
@ -1194,7 +1194,7 @@ static int ip6gre_tunnel_ioctl(struct net_device *dev,
case SIOCDELTUNNEL: case SIOCDELTUNNEL:
err = -EPERM; err = -EPERM;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto done; goto done;
if (dev == ign->fb_tunnel_dev) { if (dev == ign->fb_tunnel_dev) {

4
net/ipv6/ip6_tunnel.c
View File

@ -1350,7 +1350,7 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
case SIOCADDTUNNEL: case SIOCADDTUNNEL:
case SIOCCHGTUNNEL: case SIOCCHGTUNNEL:
err = -EPERM; err = -EPERM;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
break; break;
err = -EFAULT; err = -EFAULT;
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
@ -1383,7 +1383,7 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
break; break;
case SIOCDELTUNNEL: case SIOCDELTUNNEL:
err = -EPERM; err = -EPERM;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
break; break;
if (dev == ip6n->fb_tnl_dev) { if (dev == ip6n->fb_tnl_dev) {

2
net/ipv6/ip6mr.c
View File

@ -1583,7 +1583,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
return -ENOENT; return -ENOENT;
if (optname != MRT6_INIT) { if (optname != MRT6_INIT) {
if (sk != mrt->mroute6_sk && !capable(CAP_NET_ADMIN)) if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EACCES; return -EACCES;
} }

7
net/ipv6/ipv6_sockglue.c
View File

@ -343,7 +343,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
break; break;
case IPV6_TRANSPARENT: case IPV6_TRANSPARENT:
if (valbool && !capable(CAP_NET_ADMIN) && !capable(CAP_NET_RAW)) { if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
!ns_capable(net->user_ns, CAP_NET_RAW)) {
retv = -EPERM; retv = -EPERM;
break; break;
} }
@ -381,7 +382,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
/* hop-by-hop / destination options are privileged option */ /* hop-by-hop / destination options are privileged option */
retv = -EPERM; retv = -EPERM;
if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW)) if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
break; break;
opt = ipv6_renew_options(sk, np->opt, optname, opt = ipv6_renew_options(sk, np->opt, optname,
@ -754,7 +755,7 @@ done:
case IPV6_IPSEC_POLICY: case IPV6_IPSEC_POLICY:
case IPV6_XFRM_POLICY: case IPV6_XFRM_POLICY:
retv = -EPERM; retv = -EPERM;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
break; break;
retv = xfrm_user_policy(sk, optname, optval, optlen); retv = xfrm_user_policy(sk, optname, optval, optlen);
break; break;

8
net/ipv6/netfilter/ip6_tables.c
View File

@ -1854,7 +1854,7 @@ compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
{ {
int ret; int ret;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM; return -EPERM;
switch (cmd) { switch (cmd) {
@ -1969,7 +1969,7 @@ compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
{ {
int ret; int ret;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM; return -EPERM;
switch (cmd) { switch (cmd) {
@ -1991,7 +1991,7 @@ do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
{ {
int ret; int ret;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM; return -EPERM;
switch (cmd) { switch (cmd) {
@ -2016,7 +2016,7 @@ do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
{ {
int ret; int ret;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM; return -EPERM;
switch (cmd) { switch (cmd) {

2
net/ipv6/route.c
View File

@ -2036,7 +2036,7 @@ int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
switch(cmd) { switch(cmd) {
case SIOCADDRT: /* Add a route */ case SIOCADDRT: /* Add a route */
case SIOCDELRT: /* Delete a route */ case SIOCDELRT: /* Delete a route */
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM; return -EPERM;
err = copy_from_user(&rtmsg, arg, err = copy_from_user(&rtmsg, arg,
sizeof(struct in6_rtmsg)); sizeof(struct in6_rtmsg));

8
net/ipv6/sit.c
View File

@ -988,7 +988,7 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
case SIOCADDTUNNEL: case SIOCADDTUNNEL:
case SIOCCHGTUNNEL: case SIOCCHGTUNNEL:
err = -EPERM; err = -EPERM;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto done; goto done;
err = -EFAULT; err = -EFAULT;
@ -1032,7 +1032,7 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
case SIOCDELTUNNEL: case SIOCDELTUNNEL:
err = -EPERM; err = -EPERM;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto done; goto done;
if (dev == sitn->fb_tunnel_dev) { if (dev == sitn->fb_tunnel_dev) {
@ -1065,7 +1065,7 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
case SIOCDELPRL: case SIOCDELPRL:
case SIOCCHGPRL: case SIOCCHGPRL:
err = -EPERM; err = -EPERM;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto done; goto done;
err = -EINVAL; err = -EINVAL;
if (dev == sitn->fb_tunnel_dev) if (dev == sitn->fb_tunnel_dev)
@ -1094,7 +1094,7 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
case SIOCCHG6RD: case SIOCCHG6RD:
case SIOCDEL6RD: case SIOCDEL6RD:
err = -EPERM; err = -EPERM;
if (!capable(CAP_NET_ADMIN)) if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto done; goto done;
err = -EFAULT; err = -EFAULT;