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-rw-r--r--security/apparmor/lsm.c130
1 files changed, 125 insertions, 5 deletions
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index aa35939443c4..42446a216f3b 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -23,6 +23,8 @@
#include <linux/sysctl.h>
#include <linux/audit.h>
#include <linux/user_namespace.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv6.h>
#include <net/sock.h>
#include "include/apparmor.h"
@@ -114,13 +116,13 @@ static int apparmor_ptrace_access_check(struct task_struct *child,
struct aa_label *tracer, *tracee;
int error;
- tracer = begin_current_label_crit_section();
+ tracer = __begin_current_label_crit_section();
tracee = aa_get_task_label(child);
error = aa_may_ptrace(tracer, tracee,
(mode & PTRACE_MODE_READ) ? AA_PTRACE_READ
: AA_PTRACE_TRACE);
aa_put_label(tracee);
- end_current_label_crit_section(tracer);
+ __end_current_label_crit_section(tracer);
return error;
}
@@ -130,11 +132,11 @@ static int apparmor_ptrace_traceme(struct task_struct *parent)
struct aa_label *tracer, *tracee;
int error;
- tracee = begin_current_label_crit_section();
+ tracee = __begin_current_label_crit_section();
tracer = aa_get_task_label(parent);
error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE);
aa_put_label(tracer);
- end_current_label_crit_section(tracee);
+ __end_current_label_crit_section(tracee);
return error;
}
@@ -1020,6 +1022,7 @@ static int apparmor_socket_shutdown(struct socket *sock, int how)
return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
}
+#ifdef CONFIG_NETWORK_SECMARK
/**
* apparmor_socket_sock_recv_skb - check perms before associating skb to sk
*
@@ -1030,8 +1033,15 @@ static int apparmor_socket_shutdown(struct socket *sock, int how)
*/
static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
- return 0;
+ struct aa_sk_ctx *ctx = SK_CTX(sk);
+
+ if (!skb->secmark)
+ return 0;
+
+ return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
+ skb->secmark, sk);
}
+#endif
static struct aa_label *sk_peer_label(struct sock *sk)
@@ -1126,6 +1136,20 @@ static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
ctx->label = aa_get_current_label();
}
+#ifdef CONFIG_NETWORK_SECMARK
+static int apparmor_inet_conn_request(struct sock *sk, struct sk_buff *skb,
+ struct request_sock *req)
+{
+ struct aa_sk_ctx *ctx = SK_CTX(sk);
+
+ if (!skb->secmark)
+ return 0;
+
+ return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
+ skb->secmark, sk);
+}
+#endif
+
static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
@@ -1177,12 +1201,17 @@ static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
+#ifdef CONFIG_NETWORK_SECMARK
LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
+#endif
LSM_HOOK_INIT(socket_getpeersec_stream,
apparmor_socket_getpeersec_stream),
LSM_HOOK_INIT(socket_getpeersec_dgram,
apparmor_socket_getpeersec_dgram),
LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
+#ifdef CONFIG_NETWORK_SECMARK
+ LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
+#endif
LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
LSM_HOOK_INIT(cred_free, apparmor_cred_free),
@@ -1538,6 +1567,97 @@ static inline int apparmor_init_sysctl(void)
}
#endif /* CONFIG_SYSCTL */
+#if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
+static unsigned int apparmor_ip_postroute(void *priv,
+ struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ struct aa_sk_ctx *ctx;
+ struct sock *sk;
+
+ if (!skb->secmark)
+ return NF_ACCEPT;
+
+ sk = skb_to_full_sk(skb);
+ if (sk == NULL)
+ return NF_ACCEPT;
+
+ ctx = SK_CTX(sk);
+ if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
+ skb->secmark, sk))
+ return NF_ACCEPT;
+
+ return NF_DROP_ERR(-ECONNREFUSED);
+
+}
+
+static unsigned int apparmor_ipv4_postroute(void *priv,
+ struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return apparmor_ip_postroute(priv, skb, state);
+}
+
+static unsigned int apparmor_ipv6_postroute(void *priv,
+ struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return apparmor_ip_postroute(priv, skb, state);
+}
+
+static const struct nf_hook_ops apparmor_nf_ops[] = {
+ {
+ .hook = apparmor_ipv4_postroute,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_POST_ROUTING,
+ .priority = NF_IP_PRI_SELINUX_FIRST,
+ },
+#if IS_ENABLED(CONFIG_IPV6)
+ {
+ .hook = apparmor_ipv6_postroute,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_POST_ROUTING,
+ .priority = NF_IP6_PRI_SELINUX_FIRST,
+ },
+#endif
+};
+
+static int __net_init apparmor_nf_register(struct net *net)
+{
+ int ret;
+
+ ret = nf_register_net_hooks(net, apparmor_nf_ops,
+ ARRAY_SIZE(apparmor_nf_ops));
+ return ret;
+}
+
+static void __net_exit apparmor_nf_unregister(struct net *net)
+{
+ nf_unregister_net_hooks(net, apparmor_nf_ops,
+ ARRAY_SIZE(apparmor_nf_ops));
+}
+
+static struct pernet_operations apparmor_net_ops = {
+ .init = apparmor_nf_register,
+ .exit = apparmor_nf_unregister,
+};
+
+static int __init apparmor_nf_ip_init(void)
+{
+ int err;
+
+ if (!apparmor_enabled)
+ return 0;
+
+ err = register_pernet_subsys(&apparmor_net_ops);
+ if (err)
+ panic("Apparmor: register_pernet_subsys: error %d\n", err);
+
+ return 0;
+}
+__initcall(apparmor_nf_ip_init);
+#endif
+
static int __init apparmor_init(void)
{
int error;