AUDIT: Capture sys_socketcall arguments and sockaddrs

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

include/linux/audit.h

@@ -69,8 +69,9 @@
 #define AUDIT_FS_WATCH		1301	/* Filesystem watch event */
 #define AUDIT_PATH		1302	/* Filname path information */
 #define AUDIT_IPC		1303	/* IPC record */
-#define AUDIT_SOCKET		1304	/* Socket record */
+#define AUDIT_SOCKETCALL	1304	/* sys_socketcall arguments */
 #define AUDIT_CONFIG_CHANGE	1305	/* Audit system configuration change */
+#define AUDIT_SOCKADDR		1306	/* sockaddr copied as syscall arg */
 
 #define AUDIT_AVC		1400	/* SE Linux avc denial or grant */
 #define AUDIT_SELINUX_ERR	1401	/* Internal SE Linux Errors */
@@ -235,6 +236,8 @@ extern int audit_get_stamp(struct audit_context *ctx,
 extern int  audit_set_loginuid(struct task_struct *task, uid_t loginuid);
 extern uid_t audit_get_loginuid(struct audit_context *ctx);
 extern int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode);
+extern int audit_socketcall(int nargs, unsigned long *args);
+extern int audit_sockaddr(int len, void *addr);
 extern void audit_signal_info(int sig, struct task_struct *t);
 #else
 #define audit_alloc(t) ({ 0; })
@@ -248,6 +251,8 @@ extern void audit_signal_info(int sig, struct task_struct *t);
 #define audit_get_stamp(c,t,s) ({ 0; })
 #define audit_get_loginuid(c) ({ -1; })
 #define audit_ipc_perms(q,u,g,m) ({ 0; })
+#define audit_socketcall(n,a) ({ 0; })
+#define audit_sockaddr(len, addr) ({ 0; })
 #define audit_signal_info(s,t) do { ; } while (0)
 #endif
 

kernel/auditsc.c

@@ -34,7 +34,7 @@
 #include <asm/types.h>
 #include <linux/mm.h>
 #include <linux/module.h>
-
+#include <linux/socket.h>
 #include <linux/audit.h>
 #include <linux/personality.h>
 #include <linux/time.h>
@@ -112,6 +112,18 @@ struct audit_aux_data_ipcctl {
 	mode_t			mode;
 };
 
+struct audit_aux_data_socketcall {
+	struct audit_aux_data	d;
+	int			nargs;
+	unsigned long		args[0];
+};
+
+struct audit_aux_data_sockaddr {
+	struct audit_aux_data	d;
+	int			len;
+	char			a[0];
+};
+
 
 /* The per-task audit context. */
 struct audit_context {
@@ -694,7 +706,22 @@ static void audit_log_exit(struct audit_context *context)
 			audit_log_format(ab, 
 					 " qbytes=%lx iuid=%d igid=%d mode=%x",
 					 axi->qbytes, axi->uid, axi->gid, axi->mode);
-			}
+			break; }
+
+		case AUDIT_SOCKETCALL: {
+			int i;
+			struct audit_aux_data_socketcall *axs = (void *)aux;
+			audit_log_format(ab, "nargs=%d", axs->nargs);
+			for (i=0; i<axs->nargs; i++)
+				audit_log_format(ab, " a%d=%lx", i, axs->args[i]);
+			break; }
+
+		case AUDIT_SOCKADDR: {
+			struct audit_aux_data_sockaddr *axs = (void *)aux;
+
+			audit_log_format(ab, "saddr=");
+			audit_log_hex(ab, axs->a, axs->len);
+			break; }
 		}
 		audit_log_end(ab);
 
@@ -1053,6 +1080,48 @@ int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)
 	return 0;
 }
 
+int audit_socketcall(int nargs, unsigned long *args)
+{
+	struct audit_aux_data_socketcall *ax;
+	struct audit_context *context = current->audit_context;
+
+	if (likely(!context))
+		return 0;
+
+	ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL);
+	if (!ax)
+		return -ENOMEM;
+
+	ax->nargs = nargs;
+	memcpy(ax->args, args, nargs * sizeof(unsigned long));
+
+	ax->d.type = AUDIT_SOCKETCALL;
+	ax->d.next = context->aux;
+	context->aux = (void *)ax;
+	return 0;
+}
+
+int audit_sockaddr(int len, void *a)
+{
+	struct audit_aux_data_sockaddr *ax;
+	struct audit_context *context = current->audit_context;
+
+	if (likely(!context))
+		return 0;
+
+	ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL);
+	if (!ax)
+		return -ENOMEM;
+
+	ax->len = len;
+	memcpy(ax->a, a, len);
+
+	ax->d.type = AUDIT_SOCKADDR;
+	ax->d.next = context->aux;
+	context->aux = (void *)ax;
+	return 0;
+}
+
 void audit_signal_info(int sig, struct task_struct *t)
 {
 	extern pid_t audit_sig_pid;

net/socket.c

@@ -81,6 +81,7 @@
 #include <linux/syscalls.h>
 #include <linux/compat.h>
 #include <linux/kmod.h>
+#include <linux/audit.h>
 
 #ifdef CONFIG_NET_RADIO
 #include <linux/wireless.h>		/* Note : will define WIRELESS_EXT */
@@ -226,7 +227,7 @@ int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr)
 		return 0;
 	if(copy_from_user(kaddr,uaddr,ulen))
 		return -EFAULT;
-	return 0;
+	return audit_sockaddr(ulen, kaddr);
 }
 
 /**
@@ -1907,6 +1908,10 @@ asmlinkage long sys_socketcall(int call, unsigned long __user *args)
 	if (copy_from_user(a, args, nargs[call]))
 		return -EFAULT;
 
+	err = audit_socketcall(nargs[call]/sizeof(unsigned long), args);
+	if (err)
+		return err;
+
 	a0=a[0];
 	a1=a[1];