From 72b93c5761b5e42c5742e192f46bac1696c36f4c Mon Sep 17 00:00:00 2001
From: netblue30 <netblue30@yahoo.com>
Date: Wed, 2 Nov 2016 07:49:01 -0400
Subject: major cleanup

---
 src/fseccomp/seccomp_file.c | 108 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 src/fseccomp/seccomp_file.c

(limited to 'src/fseccomp/seccomp_file.c')

diff --git a/src/fseccomp/seccomp_file.c b/src/fseccomp/seccomp_file.c
new file mode 100644
index 000000000..10ef9dd31
--- /dev/null
+++ b/src/fseccomp/seccomp_file.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2014-2016 Firejail Authors
+ *
+ * This file is part of firejail project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+#include "fseccomp.h"
+#include "../include/seccomp.h"
+#include <sys/syscall.h>
+
+static void write_to_file(int fd, void *data, int size) {
+	assert(data);
+	assert(size);
+	
+	int written = 0;
+	while (written < size) {
+		int rv = write(fd, (unsigned char *) data + written, size - written);
+		if (rv == -1) {
+			fprintf(stderr, "Error fseccomp: cannot write seccomp file\n");
+			exit(1);
+		}
+		written += rv;
+	}
+}
+
+void filter_init(int fd) {
+#if defined(__x86_64__)
+#define X32_SYSCALL_BIT 0x40000000
+	struct sock_filter filter[] = {
+		VALIDATE_ARCHITECTURE,
+		EXAMINE_SYSCALL,
+		// handle X32 ABI
+		BPF_JUMP(BPF_JMP+BPF_JGE+BPF_K, X32_SYSCALL_BIT, 1, 0),
+		BPF_JUMP(BPF_JMP+BPF_JGE+BPF_K, 0, 1, 0),
+		RETURN_ERRNO(EPERM)
+	};
+#else
+	struct sock_filter filter[] = {
+		VALIDATE_ARCHITECTURE,
+		EXAMINE_SYSCALL
+	};
+#endif
+
+#if 0
+{
+	int i;
+	unsigned char *ptr = (unsigned char *) &filter[0];
+	for (i = 0; i < sizeof(filter); i++, ptr++)
+		printf("%x, ", (*ptr) & 0xff);
+	printf("\n");
+}
+#endif
+
+	write_to_file(fd, filter, sizeof(filter));
+}
+
+void filter_add_whitelist(int fd, int syscall, int arg) {
+	(void) arg;
+	
+	struct sock_filter filter[] = {
+		WHITELIST(syscall)
+	};
+	write_to_file(fd, filter, sizeof(filter));
+}
+
+void filter_add_blacklist(int fd, int syscall, int arg) {
+	(void) arg;
+	
+	struct sock_filter filter[] = {
+		BLACKLIST(syscall)
+	};
+	write_to_file(fd, filter, sizeof(filter));
+}
+
+void filter_add_errno(int fd, int syscall, int arg) {
+	struct sock_filter filter[] = {
+		BLACKLIST_ERRNO(syscall, arg)
+	};
+	write_to_file(fd, filter, sizeof(filter));
+}
+
+void filter_end_blacklist(int fd) {
+	struct sock_filter filter[] = {
+		RETURN_ALLOW
+	};
+	write_to_file(fd, filter, sizeof(filter));
+}
+
+void filter_end_whitelist(int fd) {
+	struct sock_filter filter[] = {
+		KILL_PROCESS
+	};
+	write_to_file(fd, filter, sizeof(filter));
+}
+
-- 
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