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Introduce a sysctl that modifies the value of PROT_SOCK.

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Add net.ipv4.ip_unprivileged_port_start, which is a per namespace sysctl
that denotes the first unprivileged inet port in the namespace.  To
disable all privileged ports set this to zero.  It also checks for
overlap with the local port range.  The privileged and local range may
not overlap.

The use case for this change is to allow containerized processes to bind
to priviliged ports, but prevent them from ever being allowed to modify
their container's network configuration.  The latter is accomplished by
ensuring that the network namespace is not a child of the user
namespace.  This modification was needed to allow the container manager
to disable a namespace's priviliged port restrictions without exposing
control of the network namespace to processes in the user namespace.

Signed-off-by: Krister Johansen <kjlx@templeofstupid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Krister Johansen 2017-01-20 17:49:11 -08:00 committed by David S. Miller
parent d140199af5
commit 4548b683b7
9 changed files with 86 additions and 12 deletions
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9
Documentation/networking/ip-sysctl.txt
View File

@ -822,6 +822,15 @@ ip_local_reserved_ports - list of comma separated ranges
Default: Empty
ip_unprivileged_port_start - INTEGER
This is a per-namespace sysctl. It defines the first
unprivileged port in the network namespace. Privileged ports
require root or CAP_NET_BIND_SERVICE in order to bind to them.
To disable all privileged ports, set this to 0. It may not
overlap with the ip_local_reserved_ports range.
Default: 1024
ip_nonlocal_bind - BOOLEAN
If set, allows processes to bind() to non-local IP addresses,
which can be quite useful - but may break some applications.

10
include/net/ip.h
View File

@ -263,11 +263,21 @@ static inline bool sysctl_dev_name_is_allowed(const char *name)
return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
}
static inline int inet_prot_sock(struct net *net)
{
return net->ipv4.sysctl_ip_prot_sock;
}
#else
static inline int inet_is_local_reserved_port(struct net *net, int port)
{
return 0;
}
static inline int inet_prot_sock(struct net *net)
{
return PROT_SOCK;
}
#endif
__be32 inet_current_timestamp(void);

1
include/net/netns/ipv4.h
View File

@ -135,6 +135,7 @@ struct netns_ipv4 {
#ifdef CONFIG_SYSCTL
unsigned long *sysctl_local_reserved_ports;
int sysctl_ip_prot_sock;
#endif
#ifdef CONFIG_IP_MROUTE

5
net/ipv4/af_inet.c
View File

@ -479,7 +479,7 @@ int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
snum = ntohs(addr->sin_port);
err = -EACCES;
if (snum && snum < PROT_SOCK &&
if (snum && snum < inet_prot_sock(net) &&
!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
goto out;
@ -1700,6 +1700,9 @@ static __net_init int inet_init_net(struct net *net)
net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
net->ipv4.sysctl_ip_dynaddr = 0;
net->ipv4.sysctl_ip_early_demux = 1;
#ifdef CONFIG_SYSCTL
net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
#endif
return 0;
}

50
net/ipv4/sysctl_net_ipv4.c
View File

@ -35,6 +35,8 @@ static int ip_local_port_range_min[] = { 1, 1 };
static int ip_local_port_range_max[] = { 65535, 65535 };
static int tcp_adv_win_scale_min = -31;
static int tcp_adv_win_scale_max = 31;
static int ip_privileged_port_min;
static int ip_privileged_port_max = 65535;
static int ip_ttl_min = 1;
static int ip_ttl_max = 255;
static int tcp_syn_retries_min = 1;
@ -79,7 +81,12 @@ static int ipv4_local_port_range(struct ctl_table *table, int write,
ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
if (write && ret == 0) {
if (range[1] < range[0])
/* Ensure that the upper limit is not smaller than the lower,
* and that the lower does not encroach upon the privileged
* port limit.
*/
if ((range[1] < range[0]) ||
(range[0] < net->ipv4.sysctl_ip_prot_sock))
ret = -EINVAL;
else
set_local_port_range(net, range);
@ -88,6 +95,40 @@ static int ipv4_local_port_range(struct ctl_table *table, int write,
return ret;
}
/* Validate changes from /proc interface. */
static int ipv4_privileged_ports(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
struct net *net = container_of(table->data, struct net,
ipv4.sysctl_ip_prot_sock);
int ret;
int pports;
int range[2];
struct ctl_table tmp = {
.data = &pports,
.maxlen = sizeof(pports),
.mode = table->mode,
.extra1 = &ip_privileged_port_min,
.extra2 = &ip_privileged_port_max,
};
pports = net->ipv4.sysctl_ip_prot_sock;
ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
if (write && ret == 0) {
inet_get_local_port_range(net, &range[0], &range[1]);
/* Ensure that the local port range doesn't overlap with the
* privileged port range.
*/
if (range[0] < pports)
ret = -EINVAL;
else
net->ipv4.sysctl_ip_prot_sock = pports;
}
return ret;
}
static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
{
@ -964,6 +1005,13 @@ static struct ctl_table ipv4_net_table[] = {
.extra2 = &one,
},
#endif
{
.procname = "ip_unprivileged_port_start",
.maxlen = sizeof(int),
.data = &init_net.ipv4.sysctl_ip_prot_sock,
.mode = 0644,
.proc_handler = ipv4_privileged_ports,
},
{ }
};

3
net/ipv6/af_inet6.c
View File

@ -302,7 +302,8 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
return -EINVAL;
snum = ntohs(addr->sin6_port);
if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
if (snum && snum < inet_prot_sock(net) &&
!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
return -EACCES;
lock_sock(sk);

7
net/netfilter/ipvs/ip_vs_ctl.c
View File

@ -426,10 +426,9 @@ ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol
*/
svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, vport);
if (svc == NULL
&& protocol == IPPROTO_TCP
&& atomic_read(&ipvs->ftpsvc_counter)
&& (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) {
if (!svc && protocol == IPPROTO_TCP &&
atomic_read(&ipvs->ftpsvc_counter) &&
(vport == FTPDATA || ntohs(vport) >= inet_prot_sock(ipvs->net))) {
/*
* Check if ftp service entry exists, the packet
* might belong to FTP data connections.

10
net/sctp/socket.c
View File

@ -360,7 +360,7 @@ static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
}
}
if (snum && snum < PROT_SOCK &&
if (snum && snum < inet_prot_sock(net) &&
!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
return -EACCES;
@ -1152,8 +1152,10 @@ static int __sctp_connect(struct sock *sk,
* accept new associations, but it SHOULD NOT
* be permitted to open new associations.
*/
if (ep->base.bind_addr.port < PROT_SOCK &&
!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
if (ep->base.bind_addr.port <
inet_prot_sock(net) &&
!ns_capable(net->user_ns,
CAP_NET_BIND_SERVICE)) {
err = -EACCES;
goto out_free;
}
@ -1818,7 +1820,7 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
* but it SHOULD NOT be permitted to open new
* associations.
*/
if (ep->base.bind_addr.port < PROT_SOCK &&
if (ep->base.bind_addr.port < inet_prot_sock(net) &&
!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
err = -EACCES;
goto out_unlock;

3
security/selinux/hooks.c
View File

@ -4365,7 +4365,8 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
inet_get_local_port_range(sock_net(sk), &low, &high);
if (snum < max(PROT_SOCK, low) || snum > high) {
if (snum < max(inet_prot_sock(sock_net(sk)), low) ||
snum > high) {
err = sel_netport_sid(sk->sk_protocol,
snum, &sid);
if (err)