Paranoid network.

With CONFIG_ANDROID_PARANOID_NETWORK, require specific uids/gids to instantiate
network sockets.

Signed-off-by: Robert Love <rlove@google.com>
paranoid networking: Use in_egroup_p() to check group membership

The previous group_search() caused trouble for partners with module builds.
in_egroup_p() is also cleaner.

Signed-off-by: Nick Pelly <npelly@google.com>
Fix 2.6.29 build.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
net: Fix compilation of the IPv6 module

Fix compilation of the IPv6 module -- current->euid does not exist anymore,
current_euid() is what needs to be used.

Signed-off-by: Steinar H. Gunderson <sesse@google.com>

diff --git a/net/Kconfig b/net/Kconfig
index e926884c1675c04c3d150ddc83eaa89f91a0cb4a..9d5023de0416d45c6ac20f339cbaa800de0bff9e 100644 (file)
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -79,6 +79,12 @@ source "net/netlabel/Kconfig"
 
 endif # if INET
 
+config ANDROID_PARANOID_NETWORK
+       bool "Only allow certain groups to create sockets"
+       default y
+       help
+               none
+
 config NETWORK_SECMARK
        bool "Security Marking"
        help

diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index 421c45bd1b95232e0a4ac7a282fdaeabd18fb21d..9c60673842c12bc68e49ab1b680b08f099ce7384 100644 (file)
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -40,6 +40,15 @@
 
 #include <net/bluetooth/bluetooth.h>
 
+#ifdef CONFIG_ANDROID_PARANOID_NETWORK
+#include <linux/android_aid.h>
+#endif
+
+#ifndef CONFIG_BT_SOCK_DEBUG
+#undef  BT_DBG
+#define BT_DBG(D...)
+#endif
+
 #define VERSION "2.15"
 
 /* Bluetooth sockets */
@@ -125,11 +134,40 @@ int bt_sock_unregister(int proto)
 }
 EXPORT_SYMBOL(bt_sock_unregister);
 
+#ifdef CONFIG_ANDROID_PARANOID_NETWORK
+static inline int current_has_bt_admin(void)
+{
+       return (!current_euid() || in_egroup_p(AID_NET_BT_ADMIN));
+}
+
+static inline int current_has_bt(void)
+{
+       return (current_has_bt_admin() || in_egroup_p(AID_NET_BT));
+}
+# else
+static inline int current_has_bt_admin(void)
+{
+       return 1;
+}
+
+static inline int current_has_bt(void)
+{
+       return 1;
+}
+#endif
+
 static int bt_sock_create(struct net *net, struct socket *sock, int proto,
                          int kern)
 {
        int err;
 
+       if (proto == BTPROTO_RFCOMM || proto == BTPROTO_SCO ||
+                       proto == BTPROTO_L2CAP) {
+               if (!current_has_bt())
+                       return -EPERM;
+       } else if (!current_has_bt_admin())
+               return -EPERM;
+
        if (net != &init_net)
                return -EAFNOSUPPORT;
 

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 6a1100c25a9f881f204934b1687b422384527f9a..553930e2ba287b721a528fad47c35748754b643b 100644 (file)
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -117,6 +117,9 @@
 #include <linux/mroute.h>
 #endif
 
+#ifdef CONFIG_ANDROID_PARANOID_NETWORK
+#include <linux/android_aid.h>
+#endif
 
 /* The inetsw table contains everything that inet_create needs to
  * build a new socket.
@@ -259,6 +262,29 @@ static inline int inet_netns_ok(struct net *net, int protocol)
        return ipprot->netns_ok;
 }
 
+#ifdef CONFIG_ANDROID_PARANOID_NETWORK
+static inline int current_has_network(void)
+{
+       return (!current_euid() || in_egroup_p(AID_INET) ||
+               in_egroup_p(AID_NET_RAW));
+}
+static inline int current_has_cap(int cap)
+{
+       if (cap == CAP_NET_RAW && in_egroup_p(AID_NET_RAW))
+               return 1;
+       return capable(cap);
+}
+# else
+static inline int current_has_network(void)
+{
+       return 1;
+}
+static inline int current_has_cap(int cap)
+{
+       return capable(cap);
+}
+#endif
+
 /*
  *     Create an inet socket.
  */
@@ -275,6 +301,9 @@ static int inet_create(struct net *net, struct socket *sock, int protocol,
        int try_loading_module = 0;
        int err;
 
+       if (!current_has_network())
+               return -EACCES;
+
        if (unlikely(!inet_ehash_secret))
                if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
                        build_ehash_secret();
@@ -327,7 +356,7 @@ lookup_protocol:
        }
 
        err = -EPERM;
-       if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
+       if (sock->type == SOCK_RAW && !kern && !current_has_cap(CAP_NET_RAW))
                goto out_rcu_unlock;
 
        err = -EAFNOSUPPORT;

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 56b9bf2516f4d45b5b866e1e3086f54a05a7b530..9f06eb916682dd518b1199381557c84cc711a531 100644 (file)
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -63,6 +63,10 @@
 #include <asm/system.h>
 #include <linux/mroute6.h>
 
+#ifdef CONFIG_ANDROID_PARANOID_NETWORK
+#include <linux/android_aid.h>
+#endif
+
 MODULE_AUTHOR("Cast of dozens");
 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
 MODULE_LICENSE("GPL");
@@ -96,6 +100,29 @@ static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
        return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 }
 
+#ifdef CONFIG_ANDROID_PARANOID_NETWORK
+static inline int current_has_network(void)
+{
+       return (!current_euid() || in_egroup_p(AID_INET) ||
+               in_egroup_p(AID_NET_RAW));
+}
+static inline int current_has_cap(int cap)
+{
+       if (cap == CAP_NET_RAW && in_egroup_p(AID_NET_RAW))
+               return 1;
+       return capable(cap);
+}
+# else
+static inline int current_has_network(void)
+{
+       return 1;
+}
+static inline int current_has_cap(int cap)
+{
+       return capable(cap);
+}
+#endif
+
 static int inet6_create(struct net *net, struct socket *sock, int protocol,
                        int kern)
 {
@@ -109,6 +136,9 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol,
        int try_loading_module = 0;
        int err;
 
+       if (!current_has_network())
+               return -EACCES;
+
        if (sock->type != SOCK_RAW &&
            sock->type != SOCK_DGRAM &&
            !inet_ehash_secret)
@@ -160,7 +190,7 @@ lookup_protocol:
        }
 
        err = -EPERM;
-       if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
+       if (sock->type == SOCK_RAW && !kern && !current_has_cap(CAP_NET_RAW))
                goto out_rcu_unlock;
 
        sock->ops = answer->ops;