Browse code
Add mkseccomp.pl, helper script to make seccomp profiles.
Martijn van Oosterhout authored on 2013/11/27 00:03:36Showing 2 changed files
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+#!/usr/bin/perl |
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+# |
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+# A simple helper script to help people build seccomp profiles for |
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+# Docker/LXC. The goal is mostly to reduce the attack surface to the |
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+# kernel, by restricting access to rarely used, recently added or not used |
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+# syscalls. |
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+# |
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+# This script processes one or more files which contain the list of system |
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+# calls to be allowed. See mkseccomp.sample for more information how you |
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+# can configure the list of syscalls. When run, this script produces output |
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+# which, when stored in a file, can be passed to docker as follows: |
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+# |
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+# docker run -lxc-conf="lxc.seccomp=$file" <rest of arguments> |
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+# |
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+# The included sample file shows how to cut about a quarter of all syscalls, |
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+# which affecting most applications. |
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+# |
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+# For specific situations it is possible to reduce the list further. By |
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+# reducing the list to just those syscalls required by a certain application |
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+# you can make it difficult for unknown/unexpected code to run. |
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+# |
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+# Run this script as follows: |
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+# |
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+# ./mkseccomp.pl < mkseccomp.sample >syscalls.list |
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+# or |
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+# ./mkseccomp.pl mkseccomp.sample >syscalls.list |
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+# |
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+# Multiple files can be specified, in which case the lists of syscalls are |
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+# combined. |
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+# |
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+# By Martijn van Oosterhout <kleptog@svana.org> Nov 2013 |
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+ |
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+# How it works: |
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+# |
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+# This program basically spawns two processes to form a chain like: |
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+# |
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+# <process data section to prefix __NR_> | cpp | <add header and filter unknown syscalls> |
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+ |
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+use strict; |
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+use warnings; |
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+ |
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+if( -t ) {
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+ print STDERR "Helper script to make seccomp filters for Docker/LXC.\n"; |
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+ print STDERR "Usage: mkseccomp.pl [files...]\n"; |
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+ exit 1; |
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+} |
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+ |
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+my $pid = open(my $in, "-|") // die "Couldn't fork1 ($!)\n"; |
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+ |
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+if($pid == 0) { # Child
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+ $pid = open(my $out, "|-") // die "Couldn't fork2 ($!)\n"; |
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+ |
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+ if($pid == 0) { # Child, which execs cpp
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+ exec "cpp" or die "Couldn't exec cpp ($!)\n"; |
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+ exit 1; |
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+ } |
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+ |
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+ # Process the DATA section and output to cpp |
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+ print $out "#include <sys/syscall.h>\n"; |
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+ while(<>) {
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+ if(/^\w/) {
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+ print $out "__NR_$_"; |
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+ } |
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+ } |
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+ close $out; |
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+ exit 0; |
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+ |
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+} |
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+ |
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+# Print header and then process output from cpp. |
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+print "1\n"; |
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+print "whitelist\n"; |
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+ |
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+while(<$in>) {
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+ print if( /^[0-9]/ ); |
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+} |
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+ |
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+/* This sample file is an example for mkseccomp.pl to produce a seccomp file |
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+ * which restricts syscalls that are only useful for an admin but allows the |
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+ * vast majority of normal userspace programs to run normally. |
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+ * |
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+ * The format of this file is one line per syscall. This is then processed |
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+ * and passed to 'cpp' to convert the names to numbers using whatever is |
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+ * correct for your platform. As such C-style comments are permitted. Note |
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+ * this also means that C preprocessor macros are also allowed. So it is |
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+ * possible to create groups surrounded by #ifdef/#endif and control their |
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+ * inclusion via #define (not #include). |
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+ * |
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+ * Syscalls that don't exist on your architecture are silently filtered out. |
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+ * Syscalls marked with (*) are required for a container to spawn a bash |
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+ * shell successfully (not necessarily full featured). Listing the same |
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+ * syscall multiple times is no problem. |
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+ * |
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+ * If you want to make a list specifically for one application the easiest |
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+ * way is to run the application under strace, like so: |
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+ * |
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+ * $ strace -f -q -c -o strace.out application args... |
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+ * |
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+ * Once you have a reasonable sample of the execution of the program, exit |
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+ * it. The file strace.out will have a summary of the syscalls used. Copy |
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+ * that list into this file, comment out everything else except the starred |
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+ * syscalls (which you need for the container to start) and you're done. |
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+ * |
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+ * To get the list of syscalls from the strace output this works well for |
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+ * me |
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+ * |
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+ * $ cut -c52 < strace.out |
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+ * |
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+ * This sample list was compiled as a combination of all the syscalls |
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+ * available on i386 and amd64 on Ubuntu Precise, as such it may not contain |
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+ * everything and not everything may be relevent for your system. This |
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+ * shouldn't be a problem. |
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+ */ |
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+ |
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+// Filesystem/File descriptor related |
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+access // (*) |
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+chdir // (*) |
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+chmod |
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+chown |
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+chown32 |
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+close // (*) |
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+creat |
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+dup // (*) |
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+dup2 // (*) |
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+dup3 |
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+epoll_create |
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+epoll_create1 |
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+epoll_ctl |
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+epoll_ctl_old |
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+epoll_pwait |
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+epoll_wait |
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+epoll_wait_old |
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+eventfd |
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+eventfd2 |
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+faccessat // (*) |
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+fadvise64 |
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+fadvise64_64 |
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+fallocate |
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+fanotify_init |
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+fanotify_mark |
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+ioctl // (*) |
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+fchdir |
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+fchmod |
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+fchmodat |
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+fchown |
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+fchown32 |
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+fchownat |
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+fcntl // (*) |
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+fcntl64 |
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+fdatasync |
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+fgetxattr |
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+flistxattr |
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+flock |
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+fremovexattr |
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+fsetxattr |
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+fstat // (*) |
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+fstat64 |
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+fstatat64 |
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+fstatfs |
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+fstatfs64 |
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+fsync |
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+ftruncate |
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+ftruncate64 |
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+getcwd // (*) |
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+getdents // (*) |
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+getdents64 |
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+getxattr |
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+inotify_add_watch |
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+inotify_init |
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+inotify_init1 |
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+inotify_rm_watch |
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+io_cancel |
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+io_destroy |
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+io_getevents |
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+io_setup |
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+io_submit |
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+lchown |
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+lchown32 |
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+lgetxattr |
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+link |
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+linkat |
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+listxattr |
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+llistxattr |
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+llseek |
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+_llseek |
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+lremovexattr |
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+lseek // (*) |
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+lsetxattr |
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+lstat |
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+lstat64 |
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+mkdir |
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+mkdirat |
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+mknod |
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+mknodat |
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+newfstatat |
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+_newselect |
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+oldfstat |
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+oldlstat |
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+oldolduname |
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+oldstat |
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+olduname |
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+oldwait4 |
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+open // (*) |
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+openat // (*) |
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+pipe // (*) |
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+pipe2 |
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+poll |
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+ppoll |
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+pread64 |
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+preadv |
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+futimesat |
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+pselect6 |
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+pwrite64 |
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+pwritev |
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+read // (*) |
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+readahead |
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+readdir |
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+readlink |
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+readlinkat |
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+readv |
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+removexattr |
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+rename |
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+renameat |
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+rmdir |
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+select |
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+sendfile |
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+sendfile64 |
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+setxattr |
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+splice |
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+stat // (*) |
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+stat64 |
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+statfs // (*) |
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+statfs64 |
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+symlink |
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+symlinkat |
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+sync |
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+sync_file_range |
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+sync_file_range2 |
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+syncfs |
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+tee |
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+truncate |
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+truncate64 |
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+umask |
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+unlink |
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+unlinkat |
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+ustat |
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+utime |
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+utimensat |
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+utimes |
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+write // (*) |
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+writev |
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+ |
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+// Network related |
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+accept |
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+accept4 |
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+bind // (*) |
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+connect // (*) |
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+getpeername |
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+getsockname // (*) |
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+getsockopt |
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+listen |
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+recv |
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+recvfrom // (*) |
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+recvmmsg |
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+recvmsg |
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+send |
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+sendmmsg |
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+sendmsg |
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+sendto // (*) |
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+setsockopt |
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+shutdown |
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+socket // (*) |
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+socketcall |
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+socketpair |
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+ |
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+// Signal related |
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+pause |
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+rt_sigaction // (*) |
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+rt_sigpending |
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+rt_sigprocmask // (*) |
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+rt_sigqueueinfo |
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+rt_sigreturn // (*) |
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+rt_sigsuspend |
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+rt_sigtimedwait |
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+rt_tgsigqueueinfo |
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+sigaction |
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+sigaltstack // (*) |
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+signal |
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+signalfd |
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+signalfd4 |
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+sigpending |
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+sigprocmask |
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+sigreturn |
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+sigsuspend |
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+ |
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+// Other needed POSIX |
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+alarm |
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+brk // (*) |
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+clock_adjtime |
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+clock_getres |
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+clock_gettime |
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+clock_nanosleep |
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+//clock_settime |
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+gettimeofday |
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+nanosleep |
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+nice |
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+sysinfo |
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+syslog |
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+time |
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+timer_create |
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+timer_delete |
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+timerfd_create |
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+timerfd_gettime |
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+timerfd_settime |
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+timer_getoverrun |
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+timer_gettime |
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+timer_settime |
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+times |
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+uname // (*) |
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+ |
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+// Memory control |
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+madvise |
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+mbind |
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+mincore |
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+mlock |
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+mlockall |
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+mmap // (*) |
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+mmap2 |
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+mprotect // (*) |
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+mremap |
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+msync |
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+munlock |
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+munlockall |
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+munmap // (*) |
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+remap_file_pages |
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+set_mempolicy |
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+vmsplice |
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+ |
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+// Process control |
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+capget |
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+//capset |
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+clone // (*) |
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+execve // (*) |
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+exit // (*) |
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+exit_group // (*) |
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+fork |
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+getcpu |
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+getpgid |
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+getpgrp // (*) |
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+getpid // (*) |
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+getppid // (*) |
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+getpriority |
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+getresgid |
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+getresgid32 |
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+getresuid |
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+getresuid32 |
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+getrlimit // (*) |
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+getrusage |
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+getsid |
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+getuid // (*) |
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+getuid32 |
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+getegid // (*) |
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+getegid32 |
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+geteuid // (*) |
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+geteuid32 |
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+getgid // (*) |
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+getgid32 |
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+getgroups |
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+getgroups32 |
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+getitimer |
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+get_mempolicy |
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+kill |
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+//personality |
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+prctl |
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+prlimit64 |
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+sched_getaffinity |
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+sched_getparam |
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+sched_get_priority_max |
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+sched_get_priority_min |
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+sched_getscheduler |
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+sched_rr_get_interval |
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+//sched_setaffinity |
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+//sched_setparam |
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+//sched_setscheduler |
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+sched_yield |
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+setfsgid |
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+setfsgid32 |
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+setfsuid |
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+setfsuid32 |
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+setgid |
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+setgid32 |
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+setgroups |
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+setgroups32 |
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+setitimer |
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+setpgid // (*) |
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+setpriority |
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+setregid |
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+setregid32 |
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+setresgid |
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+setresgid32 |
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+setresuid |
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+setresuid32 |
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+setreuid |
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+setreuid32 |
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+setrlimit |
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+setsid |
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+setuid |
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+setuid32 |
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+ugetrlimit |
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+vfork |
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+wait4 // (*) |
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+waitid |
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+waitpid |
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+ |
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+// IPC |
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+ipc |
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+mq_getsetattr |
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+mq_notify |
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+mq_open |
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+mq_timedreceive |
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+mq_timedsend |
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+mq_unlink |
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+msgctl |
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+msgget |
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+msgrcv |
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+msgsnd |
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+semctl |
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+semget |
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+semop |
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+semtimedop |
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+shmat |
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+shmctl |
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+shmdt |
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+shmget |
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+ |
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+// Linux specific, mostly needed for thread-related stuff |
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+arch_prctl // (*) |
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+get_robust_list |
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+get_thread_area |
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+gettid |
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+futex // (*) |
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+restart_syscall // (*) |
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+set_robust_list // (*) |
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+set_thread_area |
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+set_tid_address // (*) |
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+tgkill |
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+tkill |
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+ |
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+// Admin syscalls, these are blocked |
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+//acct |
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+//adjtimex |
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+//bdflush |
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+//chroot |
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+//create_module |
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+//delete_module |
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+//get_kernel_syms // Obsolete |
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+//idle // Obsolete |
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+//init_module |
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+//ioperm |
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| 382 |
+//iopl |
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+//ioprio_get |
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+//ioprio_set |
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+//kexec_load |
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+//lookup_dcookie // oprofile only? |
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+//migrate_pages // NUMA |
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+//modify_ldt |
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+//mount |
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| 390 |
+//move_pages // NUMA |
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+//name_to_handle_at // NFS server |
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+//nfsservctl // NFS server |
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+//open_by_handle_at // NFS server |
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+//perf_event_open |
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+//pivot_root |
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+//process_vm_readv // For debugger |
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+//process_vm_writev // For debugger |
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+//ptrace // For debugger |
|
| 399 |
+//query_module |
|
| 400 |
+//quotactl |
|
| 401 |
+//reboot |
|
| 402 |
+//setdomainname |
|
| 403 |
+//sethostname |
|
| 404 |
+//setns |
|
| 405 |
+//settimeofday |
|
| 406 |
+//sgetmask // Obsolete |
|
| 407 |
+//ssetmask // Obsolete |
|
| 408 |
+//stime |
|
| 409 |
+//swapoff |
|
| 410 |
+//swapon |
|
| 411 |
+//_sysctl |
|
| 412 |
+//sysfs |
|
| 413 |
+//sys_setaltroot |
|
| 414 |
+//umount |
|
| 415 |
+//umount2 |
|
| 416 |
+//unshare |
|
| 417 |
+//uselib |
|
| 418 |
+//vhangup |
|
| 419 |
+//vm86 |
|
| 420 |
+//vm86old |
|
| 421 |
+ |
|
| 422 |
+// Kernel key management |
|
| 423 |
+//add_key |
|
| 424 |
+//keyctl |
|
| 425 |
+//request_key |
|
| 426 |
+ |
|
| 427 |
+// Unimplemented |
|
| 428 |
+//afs_syscall |
|
| 429 |
+//break |
|
| 430 |
+//ftime |
|
| 431 |
+//getpmsg |
|
| 432 |
+//gtty |
|
| 433 |
+//lock |
|
| 434 |
+//madvise1 |
|
| 435 |
+//mpx |
|
| 436 |
+//prof |
|
| 437 |
+//profil |
|
| 438 |
+//putpmsg |
|
| 439 |
+//security |
|
| 440 |
+//stty |
|
| 441 |
+//tuxcall |
|
| 442 |
+//ulimit |
|
| 443 |
+//vserver |