[AppArmor 46/47] add simple network toggles to apparmor

[John@suse.de, Johansen@suse.de]

Signed-off-by: John Johansen <jjohansen@suse.de>
Signed-off-by: Jesse Michael <jmichael@suse.de>

---
 security/apparmor/Makefile           |    7 +
 security/apparmor/apparmor.h         |    7 +
 security/apparmor/lsm.c              |  129 ++++++++++++++++++++++++++++++++++-
 security/apparmor/main.c             |   96 ++++++++++++++++++++++++++
 security/apparmor/module_interface.c |   20 +++++
 5 files changed, 255 insertions(+), 4 deletions(-)

--- a/security/apparmor/Makefile
+++ b/security/apparmor/Makefile
@@ -8,6 +8,11 @@ apparmor-y := main.o list.o procattr.o l
 quiet_cmd_make-caps = GEN     $@
 cmd_make-caps = sed -n -e "/CAP_FS_MASK/d" -e "s/^\#define[ \\t]\\+CAP_\\([A-Z0-9_]\\+\\)[ \\t]\\+\\([0-9]\\+\\)\$$/[\\2]  = \"\\1\",/p" $< | tr A-Z a-z > $@
 
-$(obj)/main.o : $(obj)/capability_names.h
+quiet_cmd_make-af = GEN     $@
+cmd_make-af = sed -n -e "/AF_MAX/d" -e "/AF_LOCAL/d" -e "s/^\#define[ \\t]\\+AF_\\([A-Z0-9_]\\+\\)[ \\t]\\+\\([0-9]\\+\\)\\(.*\\)\$$/[\\2]  = \"\\1\",/p" $< | tr A-Z a-z > $@
+
+$(obj)/main.o : $(obj)/capability_names.h $(obj)/af_names.h
 $(obj)/capability_names.h : $(srctree)/include/linux/capability.h
 	$(call cmd,make-caps)
+$(obj)/af_names.h : $(srctree)/include/linux/socket.h
+	$(call cmd,make-af)
--- a/security/apparmor/apparmor.h
+++ b/security/apparmor/apparmor.h
@@ -16,6 +16,8 @@
 #include <linux/fs.h>
 #include <linux/binfmts.h>
 #include <linux/rcupdate.h>
+#include <linux/socket.h>
+#include <net/sock.h>
 
 /*
  * We use MAY_READ, MAY_WRITE, MAY_EXEC, MAY_APPEND and the following flags
@@ -169,6 +171,7 @@ struct aa_profile {
 	struct list_head task_contexts;
 	spinlock_t lock;
 	unsigned long int_flags;
+	u16 network_families[AF_MAX];
 };
 
 extern struct list_head profile_ns_list;
@@ -215,6 +218,7 @@ struct aa_audit {
 	int request_mask, denied_mask;
 	struct iattr *iattr;
 	pid_t task, parent;
+	int family, type, protocol;
 	int error_code;
 };
 
@@ -276,6 +280,9 @@ extern void aa_change_task_context(struc
 				   struct aa_profile *previous_profile);
 extern int aa_may_ptrace(struct aa_task_context *cxt,
 			 struct aa_profile *tracee);
+extern int aa_net_perm(struct aa_profile *profile, char *operation,
+			int family, int type, int protocol);
+extern int aa_revalidate_sk(struct sock *sk, char *operation);
 
 /* list.c */
 extern struct aa_namespace *__aa_find_namespace(const char *name,
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -18,6 +18,7 @@
 #include <linux/ctype.h>
 #include <linux/sysctl.h>
 #include <linux/audit.h>
+#include <net/sock.h>
 
 #include "apparmor.h"
 #include "inline.h"
@@ -616,6 +617,117 @@ static void apparmor_task_free_security(
 	aa_release(task);
 }
 
+static int apparmor_socket_create(int family, int type, int protocol, int kern)
+{
+	struct aa_profile *profile;
+	int error = 0;
+
+	if (kern)
+		return 0;
+
+	profile = aa_get_profile(current);
+	if (profile)
+		error = aa_net_perm(profile, "socket_create", family,
+							type, protocol);
+	aa_put_profile(profile);
+
+	return error;
+}
+
+static int apparmor_socket_post_create(struct socket *sock, int family,
+					int type, int protocol, int kern)
+{
+	struct sock *sk = sock->sk;
+
+	if (kern)
+		return 0;
+
+	return aa_revalidate_sk(sk, "socket_post_create");
+}
+
+static int apparmor_socket_bind(struct socket *sock,
+				struct sockaddr *address, int addrlen)
+{
+	struct sock *sk = sock->sk;
+
+	return aa_revalidate_sk(sk, "socket_bind");
+}
+
+static int apparmor_socket_connect(struct socket *sock,
+					struct sockaddr *address, int addrlen)
+{
+	struct sock *sk = sock->sk;
+
+	return aa_revalidate_sk(sk, "socket_connect");
+}
+
+static int apparmor_socket_listen(struct socket *sock, int backlog)
+{
+	struct sock *sk = sock->sk;
+
+	return aa_revalidate_sk(sk, "socket_listen");
+}
+
+static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
+{
+	struct sock *sk = sock->sk;
+
+	return aa_revalidate_sk(sk, "socket_accept");
+}
+
+static int apparmor_socket_sendmsg(struct socket *sock,
+					struct msghdr *msg, int size)
+{
+	struct sock *sk = sock->sk;
+
+	return aa_revalidate_sk(sk, "socket_sendmsg");
+}
+
+static int apparmor_socket_recvmsg(struct socket *sock,
+				   struct msghdr *msg, int size, int flags)
+{
+	struct sock *sk = sock->sk;
+
+	return aa_revalidate_sk(sk, "socket_recvmsg");
+}
+
+static int apparmor_socket_getsockname(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	return aa_revalidate_sk(sk, "socket_getsockname");
+}
+
+static int apparmor_socket_getpeername(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	return aa_revalidate_sk(sk, "socket_getpeername");
+}
+
+static int apparmor_socket_getsockopt(struct socket *sock, int level,
+					int optname)
+{
+	struct sock *sk = sock->sk;
+
+	return aa_revalidate_sk(sk, "socket_getsockopt");
+}
+
+static int apparmor_socket_setsockopt(struct socket *sock, int level,
+					int optname)
+{
+	struct sock *sk = sock->sk;
+
+	return aa_revalidate_sk(sk, "socket_setsockopt");
+}
+
+static int apparmor_socket_shutdown(struct socket *sock, int how)
+{
+	struct sock *sk = sock->sk;
+
+	return aa_revalidate_sk(sk, "socket_shutdown");
+}
+
 static int apparmor_getprocattr(struct task_struct *task, char *name,
 				char **value)
 {
@@ -716,9 +828,6 @@ struct security_operations apparmor_ops 
 	.capable =			apparmor_capable,
 	.syslog =			cap_syslog,
 
-	.netlink_send =			cap_netlink_send,
-	.netlink_recv =			cap_netlink_recv,
-
 	.bprm_apply_creds =		cap_bprm_apply_creds,
 	.bprm_set_security =		apparmor_bprm_set_security,
 	.bprm_secureexec =		apparmor_bprm_secureexec,
@@ -754,6 +863,20 @@ struct security_operations apparmor_ops 
 
 	.getprocattr =			apparmor_getprocattr,
 	.setprocattr =			apparmor_setprocattr,
+
+	.socket_create =		apparmor_socket_create,
+	.socket_post_create =		apparmor_socket_post_create,
+	.socket_bind =			apparmor_socket_bind,
+	.socket_connect =		apparmor_socket_connect,
+	.socket_listen =		apparmor_socket_listen,
+	.socket_accept =		apparmor_socket_accept,
+	.socket_sendmsg =		apparmor_socket_sendmsg,
+	.socket_recvmsg =		apparmor_socket_recvmsg,
+	.socket_getsockname =		apparmor_socket_getsockname,
+	.socket_getpeername =		apparmor_socket_getpeername,
+	.socket_getsockopt =		apparmor_socket_getsockopt,
+	.socket_setsockopt =		apparmor_socket_setsockopt,
+	.socket_shutdown =		apparmor_socket_shutdown,
 };
 
 static void info_message(const char *str)
--- a/security/apparmor/main.c
+++ b/security/apparmor/main.c
@@ -14,6 +14,9 @@
 #include <linux/audit.h>
 #include <linux/mount.h>
 #include <linux/ptrace.h>
+#include <linux/socket.h>
+#include <linux/net.h>
+#include <net/sock.h>
 
 #include "apparmor.h"
 
@@ -341,6 +344,24 @@ static void aa_audit_file_mask(struct au
 	audit_log_format(ab, " %s=\"%s::%s\"", name, user, other);
 }
 
+static const char *address_families[] = {
+#include "af_names.h"
+};
+
+static const char *sock_types[] = {
+	"unknown(0)",
+	"stream",
+	"dgram",
+	"raw",
+	"rdm",
+	"seqpacket",
+	"dccp",
+	"unknown(7)",
+	"unknown(8)",
+	"unknown(9)",
+	"packet",
+};
+
 /**
  * aa_audit - Log an audit event to the audit subsystem
  * @profile: profile to check against
@@ -406,6 +427,24 @@ static int aa_audit_base(struct aa_profi
 		audit_log_untrustedstring(ab, sa->name2);
 	}
 
+	if (sa->family || sa->type) {
+		if (address_families[sa->family])
+			audit_log_format(ab, " family=\"%s\"",
+					 address_families[sa->family]);
+		else
+			audit_log_format(ab, " family=\"unknown(%d)\"",
+					 sa->family);
+
+		if (sock_types[sa->type])
+			audit_log_format(ab, " sock_type=\"%s\"",
+					 sock_types[sa->type]);
+		else
+			audit_log_format(ab, " sock_type=\"unknown(%d)\"",
+					 sa->type);
+
+		audit_log_format(ab, " protocol=%d", sa->protocol);
+	}
+
 	audit_log_format(ab, " pid=%d", current->pid);
 
 	if (profile) {
@@ -725,6 +764,63 @@ int aa_link(struct aa_profile *profile,
 	return error;
 }
 
+int aa_net_perm(struct aa_profile *profile, char *operation,
+		int family, int type, int protocol)
+{
+	struct aa_audit sa;
+	int error = 0;
+	u16 family_mask;
+
+	if ((family < 0) || (family >= AF_MAX))
+		return -EINVAL;
+
+	if ((type < 0) || (type >= SOCK_MAX))
+		return -EINVAL;
+
+	/* unix domain and netlink sockets are handled by ipc */
+	if (family == AF_UNIX || family == AF_NETLINK)
+		return 0;
+
+	family_mask = profile->network_families[family];
+
+	error = (family_mask & (1 << type)) ? 0 : -EACCES;
+
+	memset(&sa, 0, sizeof(sa));
+	sa.operation = operation;
+	sa.gfp_mask = GFP_KERNEL;
+	sa.family = family;
+	sa.type = type;
+	sa.protocol = protocol;
+	sa.error_code = error;
+
+	error = aa_audit(profile, &sa);
+
+	return error;
+}
+
+int aa_revalidate_sk(struct sock *sk, char *operation)
+{
+	struct aa_profile *profile;
+	int error = 0;
+
+	/* this is some debugging code to flush out the network hooks that
+	   that are called in interrupt context */
+	if (in_interrupt()) {
+		printk("AppArmor Debug: Hook being called from interrupt context\n");
+		dump_stack();
+		return 0;
+	}
+
+	profile = aa_get_profile(current);
+	if (profile)
+		error = aa_net_perm(profile, operation,
+				    sk->sk_family, sk->sk_type,
+				    sk->sk_protocol);
+	aa_put_profile(profile);
+
+	return error;
+}
+
 /*******************************
  * Global task related functions
  *******************************/
--- a/security/apparmor/module_interface.c
+++ b/security/apparmor/module_interface.c
@@ -283,6 +283,8 @@ static struct aa_profile *aa_unpack_prof
 {
 	struct aa_profile *profile = NULL;
 	struct aa_audit sa;
+	size_t size = 0;
+	int i;
 
 	int error = -EPROTO;
 
@@ -311,6 +313,24 @@ static struct aa_profile *aa_unpack_prof
 	if (!aa_is_u32(e, &(profile->capabilities), NULL))
 		goto fail;
 
+	size = aa_is_array(e, "net_allowed_af");
+	if (size) {
+		if (size > AF_MAX)
+			goto fail;
+
+		for (i = 0; i < size; i++) {
+			if (!aa_is_u16(e, &profile->network_families[i], NULL))
+				goto fail;
+		}
+		if (!aa_is_nameX(e, AA_ARRAYEND, NULL))
+			goto fail;
+		/* allow unix domain and netlink sockets they are handled
+		 * by IPC
+		 */
+	}
+	profile->network_families[AF_UNIX] = 0xffff;
+	profile->network_families[AF_NETLINK] = 0xffff;
+
 	/* get file rules */
 	profile->file_rules = aa_unpack_dfa(e);
 	if (IS_ERR(profile->file_rules)) {

-- 

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