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Subject[RFC PATCH 13/14] userns: net: make many network capable calls targeted
Date
From: Serge E. Hallyn <serge.hallyn@canonical.com>

When privilege is protected a namespaced network resource, then having
the required privilege targed toward the user namespace which owns the
resource suffices.

As with other patches, a big concern here is that we be cleanly separating
the cases where privilege protects a network resource from cases where
privilege can lead to laxer constraints on input and, subsequently,
the ability to corrupt, crash, or own the host kernel.

Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
---
net/8021q/vlan.c | 12 ++++++------
net/bridge/br_ioctl.c | 22 +++++++++++-----------
net/bridge/br_sysfs_br.c | 8 ++++----
net/bridge/br_sysfs_if.c | 2 +-
net/bridge/netfilter/ebtables.c | 8 ++++----
net/core/ethtool.c | 2 +-
net/ipv4/arp.c | 2 +-
net/ipv4/devinet.c | 4 ++--
net/ipv4/fib_frontend.c | 2 +-
net/ipv4/ip_options.c | 6 +++---
net/ipv4/ip_sockglue.c | 4 ++--
net/ipv4/ipip.c | 4 ++--
net/ipv4/ipmr.c | 2 +-
net/ipv4/netfilter/arp_tables.c | 8 ++++----
net/ipv4/netfilter/ip_tables.c | 8 ++++----
net/netfilter/ipset/ip_set_core.c | 2 +-
net/netfilter/ipvs/ip_vs_ctl.c | 4 ++--
net/packet/af_packet.c | 2 +-
18 files changed, 51 insertions(+), 51 deletions(-)
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 917ecb9..46a4801 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -561,7 +561,7 @@ static int vlan_ioctl_handler(struct net *net, void __user *arg)
switch (args.cmd) {
case SET_VLAN_INGRESS_PRIORITY_CMD:
err = -EPERM;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
break;
vlan_dev_set_ingress_priority(dev,
args.u.skb_priority,
@@ -571,7 +571,7 @@ static int vlan_ioctl_handler(struct net *net, void __user *arg)

case SET_VLAN_EGRESS_PRIORITY_CMD:
err = -EPERM;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
break;
err = vlan_dev_set_egress_priority(dev,
args.u.skb_priority,
@@ -580,7 +580,7 @@ static int vlan_ioctl_handler(struct net *net, void __user *arg)

case SET_VLAN_FLAG_CMD:
err = -EPERM;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
break;
err = vlan_dev_change_flags(dev,
args.vlan_qos ? args.u.flag : 0,
@@ -589,7 +589,7 @@ static int vlan_ioctl_handler(struct net *net, void __user *arg)

case SET_VLAN_NAME_TYPE_CMD:
err = -EPERM;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
break;
if ((args.u.name_type >= 0) &&
(args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
@@ -605,14 +605,14 @@ static int vlan_ioctl_handler(struct net *net, void __user *arg)

case ADD_VLAN_CMD:
err = -EPERM;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
break;
err = register_vlan_device(dev, args.u.VID);
break;

case DEL_VLAN_CMD:
err = -EPERM;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
break;
unregister_vlan_dev(dev, NULL);
err = 0;
diff --git a/net/bridge/br_ioctl.c b/net/bridge/br_ioctl.c
index 7222fe1..c82f9cb 100644
--- a/net/bridge/br_ioctl.c
+++ b/net/bridge/br_ioctl.c
@@ -88,7 +88,7 @@ static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
struct net_device *dev;
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

dev = __dev_get_by_index(dev_net(br->dev), ifindex);
@@ -178,25 +178,25 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
}

case BRCTL_SET_BRIDGE_FORWARD_DELAY:
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

return br_set_forward_delay(br, args[1]);

case BRCTL_SET_BRIDGE_HELLO_TIME:
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

return br_set_hello_time(br, args[1]);

case BRCTL_SET_BRIDGE_MAX_AGE:
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

return br_set_max_age(br, args[1]);

case BRCTL_SET_AGEING_TIME:
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

br->ageing_time = clock_t_to_jiffies(args[1]);
@@ -236,14 +236,14 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
}

case BRCTL_SET_BRIDGE_STP_STATE:
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

br_stp_set_enabled(br, args[1]);
return 0;

case BRCTL_SET_BRIDGE_PRIORITY:
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

spin_lock_bh(&br->lock);
@@ -256,7 +256,7 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
struct net_bridge_port *p;
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

spin_lock_bh(&br->lock);
@@ -273,7 +273,7 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
struct net_bridge_port *p;
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

spin_lock_bh(&br->lock);
@@ -330,7 +330,7 @@ static int old_deviceless(struct net *net, void __user *uarg)
{
char buf[IFNAMSIZ];

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;

if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
@@ -360,7 +360,7 @@ int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uar
{
char buf[IFNAMSIZ];

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;

if (copy_from_user(buf, uarg, IFNAMSIZ))
diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c
index 68b893e..7f4fa3a 100644
--- a/net/bridge/br_sysfs_br.c
+++ b/net/bridge/br_sysfs_br.c
@@ -36,7 +36,7 @@ static ssize_t store_bridge_parm(struct device *d,
unsigned long val;
int err;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

val = simple_strtoul(buf, &endp, 0);
@@ -132,7 +132,7 @@ static ssize_t store_stp_state(struct device *d,
char *endp;
unsigned long val;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

val = simple_strtoul(buf, &endp, 0);
@@ -267,7 +267,7 @@ static ssize_t store_group_addr(struct device *d,
unsigned new_addr[6];
int i;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

if (sscanf(buf, "%x:%x:%x:%x:%x:%x",
@@ -304,7 +304,7 @@ static ssize_t store_flush(struct device *d,
{
struct net_bridge *br = to_bridge(d);

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

br_fdb_flush(br);
diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
index 6229b62..9cb4d2e 100644
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -209,7 +209,7 @@ static ssize_t brport_store(struct kobject * kobj,
char *endp;
unsigned long val;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(dev_net(p->br->dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;

val = simple_strtoul(buf, &endp, 0);
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 2b5ca1a..c403c45 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1462,7 +1462,7 @@ static int do_ebt_set_ctl(struct sock *sk,
{
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

switch(cmd) {
@@ -1484,7 +1484,7 @@ static int do_ebt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
struct ebt_replace tmp;
struct ebt_table *t;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

if (copy_from_user(&tmp, user, sizeof(tmp)))
@@ -2275,7 +2275,7 @@ static int compat_do_ebt_set_ctl(struct sock *sk,
{
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

switch (cmd) {
@@ -2298,7 +2298,7 @@ static int compat_do_ebt_get_ctl(struct sock *sk, int cmd,
struct compat_ebt_replace tmp;
struct ebt_table *t;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

/* try real handler in case userland supplied needed padding */
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index fd14116..4ee227b 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1980,7 +1980,7 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
case ETHTOOL_GFEATURES:
break;
default:
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
}

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 1b74d3b..b67c075 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -1208,7 +1208,7 @@ int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg)
switch (cmd) {
case SIOCDARP:
case SIOCSARP:
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
case SIOCGARP:
err = copy_from_user(&r, arg, sizeof(struct arpreq));
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 0d4a184..42d93a4 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -728,7 +728,7 @@ int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)

case SIOCSIFFLAGS:
ret = -EACCES;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto out;
break;
case SIOCSIFADDR: /* Set interface address (and family) */
@@ -736,7 +736,7 @@ int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
case SIOCSIFDSTADDR: /* Set the destination address */
case SIOCSIFNETMASK: /* Set the netmask for the interface */
ret = -EACCES;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto out;
ret = -EINVAL;
if (sin->sin_family != AF_INET)
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 2252471..1f30cf8 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -437,7 +437,7 @@ int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
switch (cmd) {
case SIOCADDRT: /* Add a route */
case SIOCDELRT: /* Delete a route */
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;

if (copy_from_user(&rt, arg, sizeof(rt)))
diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c
index ec93335..21df700 100644
--- a/net/ipv4/ip_options.c
+++ b/net/ipv4/ip_options.c
@@ -396,7 +396,7 @@ int ip_options_compile(struct net *net,
optptr[2] += 8;
break;
default:
- if (!skb && !capable(CAP_NET_RAW)) {
+ if (!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) {
pp_ptr = optptr + 3;
goto error;
}
@@ -432,7 +432,7 @@ int ip_options_compile(struct net *net,
opt->router_alert = optptr - iph;
break;
case IPOPT_CIPSO:
- if ((!skb && !capable(CAP_NET_RAW)) || opt->cipso) {
+ if ((!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) || opt->cipso) {
pp_ptr = optptr;
goto error;
}
@@ -445,7 +445,7 @@ int ip_options_compile(struct net *net,
case IPOPT_SEC:
case IPOPT_SID:
default:
- if (!skb && !capable(CAP_NET_RAW)) {
+ if (!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) {
pp_ptr = optptr;
goto error;
}
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index ab0c9ef..972c65f 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -955,13 +955,13 @@ mc_msf_out:
case IP_IPSEC_POLICY:
case IP_XFRM_POLICY:
err = -EPERM;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
break;
err = xfrm_user_policy(sk, optname, optval, optlen);
break;

case IP_TRANSPARENT:
- if (!capable(CAP_NET_ADMIN)) {
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
err = -EPERM;
break;
}
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 378b20b..6725832 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -629,7 +629,7 @@ ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
case SIOCADDTUNNEL:
case SIOCCHGTUNNEL:
err = -EPERM;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto done;

err = -EFAULT;
@@ -689,7 +689,7 @@ ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)

case SIOCDELTUNNEL:
err = -EPERM;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
goto done;

if (dev == ipn->fb_tunnel_dev) {
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 30a7763..4e22804 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1204,7 +1204,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi

if (optname != MRT_INIT) {
if (sk != rcu_dereference_raw(mrt->mroute_sk) &&
- !capable(CAP_NET_ADMIN))
+ !ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EACCES;
}

diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index fd7a3f6..acc908f 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1534,7 +1534,7 @@ static int compat_do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user,
{
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

switch (cmd) {
@@ -1678,7 +1678,7 @@ static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user,
{
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

switch (cmd) {
@@ -1699,7 +1699,7 @@ static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned
{
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

switch (cmd) {
@@ -1723,7 +1723,7 @@ static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len
{
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

switch (cmd) {
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 24e556e..72f2cde 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1847,7 +1847,7 @@ compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user,
{
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

switch (cmd) {
@@ -1962,7 +1962,7 @@ compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
{
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

switch (cmd) {
@@ -1984,7 +1984,7 @@ do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
{
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

switch (cmd) {
@@ -2009,7 +2009,7 @@ do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
{
int ret;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;

switch (cmd) {
diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index 42aa64b..16933b2 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -1568,7 +1568,7 @@ ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len)
void *data;
int copylen = *len, ret = 0;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (optval != SO_IP_SET)
return -EBADF;
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 699c79a..65395a1 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -2284,7 +2284,7 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
struct ip_vs_dest_user *udest_compat;
struct ip_vs_dest_user_kern udest;

- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;

if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
@@ -2566,7 +2566,7 @@ do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
struct netns_ipvs *ipvs = net_ipvs(net);

BUG_ON(!net);
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;

if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index c0c3cda..ed798b0 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1496,7 +1496,7 @@ static int packet_create(struct net *net, struct socket *sock, int protocol,
__be16 proto = (__force __be16)protocol; /* weird, but documented */
int err;

- if (!capable(CAP_NET_RAW))
+ if (!ns_capable(net->user_ns, CAP_NET_RAW))
return -EPERM;
if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
sock->type != SOCK_PACKET)
--
1.7.4.1


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