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406 lines (396 loc) · 14.5 KB
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#include <Python.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <sched.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <seccomp.h>
static PyObject *ol_unshare(PyObject *module) {
int res = unshare(CLONE_NEWUTS|CLONE_NEWPID|CLONE_NEWIPC);
return Py_BuildValue("i", res);
}
static PyObject *ol_fork(PyObject *module) {
int res = fork();
return Py_BuildValue("i", res);
}
static PyObject *ol_enable_seccomp(PyObject *module) {
scmp_filter_ctx ctx = seccomp_init(SCMP_ACT_ERRNO(1));
int rc = 0;
// allow similar calls as the Docker default:
// https://github.com/moby/moby/blob/master/profiles/seccomp/default.json
// - close_range, epoll_pwait2, faccessat2, openat2
// + unshare, clone, clone3, chroot, arch_prctl
int calls[] = {
SCMP_SYS(getpid),
SCMP_SYS(write),
SCMP_SYS(clock_gettime),
SCMP_SYS(clock_gettime64),
SCMP_SYS(exit),
SCMP_SYS(accept),
SCMP_SYS(accept4),
SCMP_SYS(access),
SCMP_SYS(adjtimex),
SCMP_SYS(alarm),
SCMP_SYS(arch_prctl),
SCMP_SYS(bind),
SCMP_SYS(brk),
SCMP_SYS(capget),
SCMP_SYS(capset),
SCMP_SYS(chdir),
SCMP_SYS(chmod),
SCMP_SYS(chown),
SCMP_SYS(chown32),
SCMP_SYS(chroot),
SCMP_SYS(clock_adjtime),
SCMP_SYS(clock_adjtime64),
SCMP_SYS(clock_getres),
SCMP_SYS(clock_getres_time64),
SCMP_SYS(clock_nanosleep),
SCMP_SYS(clock_nanosleep_time64),
SCMP_SYS(clone),
SCMP_SYS(clone3),
SCMP_SYS(close),
SCMP_SYS(connect),
SCMP_SYS(copy_file_range),
SCMP_SYS(creat),
SCMP_SYS(dup),
SCMP_SYS(dup2),
SCMP_SYS(dup3),
SCMP_SYS(epoll_create),
SCMP_SYS(epoll_create1),
SCMP_SYS(epoll_ctl),
SCMP_SYS(epoll_ctl_old),
SCMP_SYS(epoll_pwait),
SCMP_SYS(epoll_wait),
SCMP_SYS(epoll_wait_old),
SCMP_SYS(eventfd),
SCMP_SYS(eventfd2),
SCMP_SYS(execve),
SCMP_SYS(execveat),
SCMP_SYS(exit_group),
SCMP_SYS(faccessat),
SCMP_SYS(fadvise64),
SCMP_SYS(fadvise64_64),
SCMP_SYS(fallocate),
SCMP_SYS(fanotify_mark),
SCMP_SYS(fchdir),
SCMP_SYS(fchmod),
SCMP_SYS(fchmodat),
SCMP_SYS(fchown),
SCMP_SYS(fchown32),
SCMP_SYS(fchownat),
SCMP_SYS(fcntl),
SCMP_SYS(fcntl64),
SCMP_SYS(fdatasync),
SCMP_SYS(fgetxattr),
SCMP_SYS(flistxattr),
SCMP_SYS(flock),
SCMP_SYS(fork),
SCMP_SYS(fremovexattr),
SCMP_SYS(fsetxattr),
SCMP_SYS(fstat),
SCMP_SYS(fstat64),
SCMP_SYS(fstatat64),
SCMP_SYS(fstatfs),
SCMP_SYS(fstatfs64),
SCMP_SYS(fsync),
SCMP_SYS(ftruncate),
SCMP_SYS(ftruncate64),
SCMP_SYS(futex),
SCMP_SYS(futex_time64),
SCMP_SYS(futimesat),
SCMP_SYS(getcpu),
SCMP_SYS(getcwd),
SCMP_SYS(getdents),
SCMP_SYS(getdents64),
SCMP_SYS(getegid),
SCMP_SYS(getegid32),
SCMP_SYS(geteuid),
SCMP_SYS(geteuid32),
SCMP_SYS(getgid),
SCMP_SYS(getgid32),
SCMP_SYS(getgroups),
SCMP_SYS(getgroups32),
SCMP_SYS(getitimer),
SCMP_SYS(getpeername),
SCMP_SYS(getpgid),
SCMP_SYS(getpgrp),
SCMP_SYS(getppid),
SCMP_SYS(getpriority),
SCMP_SYS(getrandom),
SCMP_SYS(getresgid),
SCMP_SYS(getresgid32),
SCMP_SYS(getresuid),
SCMP_SYS(getresuid32),
SCMP_SYS(getrlimit),
SCMP_SYS(get_robust_list),
SCMP_SYS(getrusage),
SCMP_SYS(getsid),
SCMP_SYS(getsockname),
SCMP_SYS(getsockopt),
SCMP_SYS(get_thread_area),
SCMP_SYS(gettid),
SCMP_SYS(gettimeofday),
SCMP_SYS(getuid),
SCMP_SYS(getuid32),
SCMP_SYS(getxattr),
SCMP_SYS(inotify_add_watch),
SCMP_SYS(inotify_init),
SCMP_SYS(inotify_init1),
SCMP_SYS(inotify_rm_watch),
SCMP_SYS(io_cancel),
SCMP_SYS(ioctl),
SCMP_SYS(io_destroy),
SCMP_SYS(io_getevents),
SCMP_SYS(io_pgetevents),
SCMP_SYS(io_pgetevents_time64),
SCMP_SYS(ioprio_get),
SCMP_SYS(ioprio_set),
SCMP_SYS(io_setup),
SCMP_SYS(io_submit),
//SCMP_SYS(__SNR_io_uring_enter),
//SCMP_SYS(__SNR_io_uring_register),
//SCMP_SYS(__SNR_io_uring_setup),
SCMP_SYS(ipc),
SCMP_SYS(kill),
SCMP_SYS(lchown),
SCMP_SYS(lchown32),
SCMP_SYS(lgetxattr),
SCMP_SYS(link),
SCMP_SYS(linkat),
SCMP_SYS(listen),
SCMP_SYS(listxattr),
SCMP_SYS(llistxattr),
SCMP_SYS(_llseek),
SCMP_SYS(lremovexattr),
SCMP_SYS(lseek),
SCMP_SYS(lsetxattr),
SCMP_SYS(lstat),
SCMP_SYS(lstat64),
SCMP_SYS(madvise),
SCMP_SYS(membarrier),
SCMP_SYS(memfd_create),
SCMP_SYS(mincore),
SCMP_SYS(mkdir),
SCMP_SYS(mkdirat),
SCMP_SYS(mknod),
SCMP_SYS(mknodat),
SCMP_SYS(mlock),
SCMP_SYS(mlock2),
SCMP_SYS(mlockall),
SCMP_SYS(mmap),
SCMP_SYS(mmap2),
SCMP_SYS(mprotect),
SCMP_SYS(mq_getsetattr),
SCMP_SYS(mq_notify),
SCMP_SYS(mq_open),
SCMP_SYS(mq_timedreceive),
SCMP_SYS(mq_timedreceive_time64),
SCMP_SYS(mq_timedsend),
SCMP_SYS(mq_timedsend_time64),
SCMP_SYS(mq_unlink),
SCMP_SYS(mremap),
SCMP_SYS(msgctl),
SCMP_SYS(msgget),
SCMP_SYS(msgrcv),
SCMP_SYS(msgsnd),
SCMP_SYS(msync),
SCMP_SYS(munlock),
SCMP_SYS(munlockall),
SCMP_SYS(munmap),
SCMP_SYS(nanosleep),
SCMP_SYS(newfstatat),
SCMP_SYS(_newselect),
SCMP_SYS(open),
SCMP_SYS(openat),
SCMP_SYS(pause),
SCMP_SYS(pidfd_open),
SCMP_SYS(pidfd_send_signal),
SCMP_SYS(pipe),
SCMP_SYS(pipe2),
SCMP_SYS(poll),
SCMP_SYS(ppoll),
SCMP_SYS(ppoll_time64),
SCMP_SYS(prctl),
SCMP_SYS(pread64),
SCMP_SYS(preadv),
SCMP_SYS(preadv2),
SCMP_SYS(prlimit64),
SCMP_SYS(pselect6),
SCMP_SYS(pselect6_time64),
SCMP_SYS(pwrite64),
SCMP_SYS(pwritev),
SCMP_SYS(pwritev2),
SCMP_SYS(read),
SCMP_SYS(readahead),
SCMP_SYS(readlink),
SCMP_SYS(readlinkat),
SCMP_SYS(readv),
SCMP_SYS(recv),
SCMP_SYS(recvfrom),
SCMP_SYS(recvmmsg),
SCMP_SYS(recvmmsg_time64),
SCMP_SYS(recvmsg),
SCMP_SYS(remap_file_pages),
SCMP_SYS(removexattr),
SCMP_SYS(rename),
SCMP_SYS(renameat),
SCMP_SYS(renameat2),
SCMP_SYS(restart_syscall),
SCMP_SYS(rmdir),
SCMP_SYS(rseq),
SCMP_SYS(rt_sigaction),
SCMP_SYS(rt_sigpending),
SCMP_SYS(rt_sigprocmask),
SCMP_SYS(rt_sigqueueinfo),
SCMP_SYS(rt_sigreturn),
SCMP_SYS(rt_sigsuspend),
SCMP_SYS(rt_sigtimedwait),
SCMP_SYS(rt_sigtimedwait_time64),
SCMP_SYS(rt_tgsigqueueinfo),
SCMP_SYS(sched_getaffinity),
SCMP_SYS(sched_getattr),
SCMP_SYS(sched_getparam),
SCMP_SYS(sched_get_priority_max),
SCMP_SYS(sched_get_priority_min),
SCMP_SYS(sched_getscheduler),
SCMP_SYS(sched_rr_get_interval),
SCMP_SYS(sched_rr_get_interval_time64),
SCMP_SYS(sched_setaffinity),
SCMP_SYS(sched_setattr),
SCMP_SYS(sched_setparam),
SCMP_SYS(sched_setscheduler),
SCMP_SYS(sched_yield),
SCMP_SYS(seccomp),
SCMP_SYS(select),
SCMP_SYS(semctl),
SCMP_SYS(semget),
SCMP_SYS(semop),
SCMP_SYS(semtimedop),
SCMP_SYS(semtimedop_time64),
SCMP_SYS(send),
SCMP_SYS(sendfile),
SCMP_SYS(sendfile64),
SCMP_SYS(sendmmsg),
SCMP_SYS(sendmsg),
SCMP_SYS(sendto),
SCMP_SYS(setfsgid),
SCMP_SYS(setfsgid32),
SCMP_SYS(setfsuid),
SCMP_SYS(setfsuid32),
SCMP_SYS(setgid),
SCMP_SYS(setgid32),
SCMP_SYS(setgroups),
SCMP_SYS(setgroups32),
SCMP_SYS(setitimer),
SCMP_SYS(setpgid),
SCMP_SYS(setpriority),
SCMP_SYS(setregid),
SCMP_SYS(setregid32),
SCMP_SYS(setresgid),
SCMP_SYS(setresgid32),
SCMP_SYS(setresuid),
SCMP_SYS(setresuid32),
SCMP_SYS(setreuid),
SCMP_SYS(setreuid32),
SCMP_SYS(setrlimit),
SCMP_SYS(set_robust_list),
SCMP_SYS(setsid),
SCMP_SYS(setsockopt),
SCMP_SYS(set_thread_area),
SCMP_SYS(set_tid_address),
SCMP_SYS(setuid),
SCMP_SYS(setuid32),
SCMP_SYS(setxattr),
SCMP_SYS(shmat),
SCMP_SYS(shmctl),
SCMP_SYS(shmdt),
SCMP_SYS(shmget),
SCMP_SYS(shutdown),
SCMP_SYS(sigaltstack),
SCMP_SYS(signalfd),
SCMP_SYS(signalfd4),
SCMP_SYS(sigprocmask),
SCMP_SYS(sigreturn),
SCMP_SYS(socket),
SCMP_SYS(socketcall),
SCMP_SYS(socketpair),
SCMP_SYS(splice),
SCMP_SYS(stat),
SCMP_SYS(stat64),
SCMP_SYS(statfs),
SCMP_SYS(statfs64),
SCMP_SYS(statx),
SCMP_SYS(symlink),
SCMP_SYS(symlinkat),
SCMP_SYS(sync),
SCMP_SYS(sync_file_range),
SCMP_SYS(syncfs),
SCMP_SYS(sysinfo),
SCMP_SYS(tee),
SCMP_SYS(tgkill),
SCMP_SYS(time),
SCMP_SYS(timer_create),
SCMP_SYS(timer_delete),
SCMP_SYS(timer_getoverrun),
SCMP_SYS(timer_gettime),
SCMP_SYS(timer_gettime64),
SCMP_SYS(timer_settime),
SCMP_SYS(timer_settime64),
SCMP_SYS(timerfd_create),
SCMP_SYS(timerfd_gettime),
SCMP_SYS(timerfd_gettime64),
SCMP_SYS(timerfd_settime),
SCMP_SYS(timerfd_settime64),
SCMP_SYS(times),
SCMP_SYS(tkill),
SCMP_SYS(truncate),
SCMP_SYS(truncate64),
SCMP_SYS(ugetrlimit),
SCMP_SYS(umask),
SCMP_SYS(uname),
SCMP_SYS(unlink),
SCMP_SYS(unlinkat),
SCMP_SYS(unshare),
SCMP_SYS(utime),
SCMP_SYS(utimensat),
SCMP_SYS(utimensat_time64),
SCMP_SYS(utimes),
SCMP_SYS(vfork),
SCMP_SYS(vmsplice),
SCMP_SYS(wait4),
SCMP_SYS(waitid),
SCMP_SYS(waitpid),
SCMP_SYS(writev)
};
for (int i=0; i<(int)(sizeof(calls)/sizeof(calls[0])); i++) {
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, calls[i], 0);
if (rc < 0) {
goto out;
}
}
rc = seccomp_load(ctx);
out:
return Py_BuildValue("i", rc);
}
static PyMethodDef OlMethods[] = {
{"unshare", (PyCFunction)ol_unshare, METH_NOARGS, "unshare"},
{"fork", (PyCFunction)ol_fork, METH_NOARGS, "fork"},
{"enable_seccomp", (PyCFunction)ol_enable_seccomp, METH_NOARGS, "enable_seccomp"},
{NULL, NULL, 0, NULL}
};
static struct PyModuleDef olMod = {
PyModuleDef_HEAD_INIT,
"ol",
NULL,
-1,
OlMethods
};
PyMODINIT_FUNC
PyInit_ol(void)
{
return PyModule_Create(&olMod);
}
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