diff --git a/net/Kconfig b/net/Kconfig index 7d57ef34b79c..88a0aa3e34d4 100644 --- a/net/Kconfig +++ b/net/Kconfig @@ -91,6 +91,12 @@ 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 91e3ba280706..91d52a80745d 100644 --- a/net/bluetooth/af_bluetooth.c +++ b/net/bluetooth/af_bluetooth.c @@ -108,11 +108,40 @@ void bt_sock_unregister(int proto) } EXPORT_SYMBOL(bt_sock_unregister); +#ifdef CONFIG_PARANOID_NETWORK +static inline int current_has_bt_admin(void) +{ + return !current_euid(); +} + +static inline int current_has_bt(void) +{ + return current_has_bt_admin(); +} +# 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 76c2077c3f5b..efeceaa9f554 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -121,6 +121,9 @@ #endif #include +#ifdef CONFIG_ANDROID_PARANOID_NETWORK +#include +#endif /* The inetsw table contains everything that inet_create needs to * build a new socket. @@ -237,6 +240,29 @@ out: } EXPORT_SYMBOL(inet_listen); +#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(struct net *net, int cap) +{ + if (cap == CAP_NET_RAW && in_egroup_p(AID_NET_RAW)) + return 1; + return ns_capable(net->user_ns, cap); +} +# else +static inline int current_has_network(void) +{ + return 1; +} +static inline int current_has_cap(struct net *net, int cap) +{ + return ns_capable(net->user_ns, cap); +} +#endif + /* * Create an inet socket. */ @@ -255,6 +281,9 @@ static int inet_create(struct net *net, struct socket *sock, int protocol, if (protocol < 0 || protocol >= IPPROTO_MAX) return -EINVAL; + if (!current_has_network()) + return -EACCES; + sock->state = SS_UNCONNECTED; /* Look for the requested type/protocol pair. */ @@ -304,7 +333,7 @@ lookup_protocol: err = -EPERM; if (sock->type == SOCK_RAW && !kern && - !ns_capable(net->user_ns, CAP_NET_RAW)) + !current_has_cap(net, CAP_NET_RAW)) goto out_rcu_unlock; sock->ops = answer->ops; diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index a88b5b5b7955..b01a9d414a3a 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -66,6 +66,10 @@ #include #include +#ifdef CONFIG_ANDROID_PARANOID_NETWORK +#include +#endif + #include "ip6_offload.h" MODULE_AUTHOR("Cast of dozens"); @@ -107,6 +111,29 @@ 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(struct net *net, int cap) +{ + if (cap == CAP_NET_RAW && in_egroup_p(AID_NET_RAW)) + return 1; + return ns_capable(net->user_ns, cap); +} +# else +static inline int current_has_network(void) +{ + return 1; +} +static inline int current_has_cap(struct net *net, int cap) +{ + return ns_capable(net->user_ns, cap); +} +#endif + static int inet6_create(struct net *net, struct socket *sock, int protocol, int kern) { @@ -122,6 +149,9 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol, if (protocol < 0 || protocol >= IPPROTO_MAX) return -EINVAL; + if (!current_has_network()) + return -EACCES; + /* Look for the requested type/protocol pair. */ lookup_protocol: err = -ESOCKTNOSUPPORT; @@ -169,7 +199,7 @@ lookup_protocol: err = -EPERM; if (sock->type == SOCK_RAW && !kern && - !ns_capable(net->user_ns, CAP_NET_RAW)) + !current_has_cap(net, CAP_NET_RAW)) goto out_rcu_unlock; sock->ops = answer->ops;