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exile.c
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/*
* Copyright (c) 2019-2022 Albert Schwarzkopf <mail at quitesimple dot org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "exile.h"
static struct syscall_vow_map exile_vow_map[] =
{
{EXILE_SYS(read), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(write), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(open), EXILE_SYSCALL_VOW_RPATH|EXILE_SYSCALL_VOW_WPATH},
{EXILE_SYS(close), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(stat), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(fstat), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(lstat), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(poll), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(lseek), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(mmap), EXILE_SYSCALL_VOW_STDIO|EXILE_SYSCALL_VOW_PROT_EXEC},
{EXILE_SYS(mprotect), EXILE_SYSCALL_VOW_STDIO|EXILE_SYSCALL_VOW_PROT_EXEC},
{EXILE_SYS(munmap), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(brk), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(rt_sigaction), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(rt_sigprocmask), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(rt_sigreturn), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(ioctl), EXILE_SYSCALL_VOW_STDIO|EXILE_SYSCALL_VOW_IOCTL},
{EXILE_SYS(pread64), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(pwrite64), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(readv), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(writev), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(access), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(pipe), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(select), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(sched_yield), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(mremap), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(msync), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(mincore), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(madvise), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(shmget), EXILE_SYSCALL_VOW_SHM},
{EXILE_SYS(shmat), EXILE_SYSCALL_VOW_SHM},
{EXILE_SYS(shmctl), EXILE_SYSCALL_VOW_SHM},
{EXILE_SYS(dup), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(dup2), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(pause), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(nanosleep), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getitimer), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(alarm), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(setitimer), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getpid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(sendfile), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(socket), EXILE_SYSCALL_VOW_INET|EXILE_SYSCALL_VOW_UNIX},
{EXILE_SYS(connect), EXILE_SYSCALL_VOW_INET|EXILE_SYSCALL_VOW_UNIX},
{EXILE_SYS(accept), EXILE_SYSCALL_VOW_INET|EXILE_SYSCALL_VOW_UNIX},
{EXILE_SYS(sendto), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(recvfrom), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(sendmsg), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(recvmsg), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(shutdown), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(bind), EXILE_SYSCALL_VOW_INET|EXILE_SYSCALL_VOW_UNIX},
{EXILE_SYS(listen), EXILE_SYSCALL_VOW_INET|EXILE_SYSCALL_VOW_UNIX},
{EXILE_SYS(getsockname), EXILE_SYSCALL_VOW_INET|EXILE_SYSCALL_VOW_UNIX},
{EXILE_SYS(getpeername), EXILE_SYSCALL_VOW_INET|EXILE_SYSCALL_VOW_UNIX},
{EXILE_SYS(socketpair), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(setsockopt), EXILE_SYSCALL_VOW_INET|EXILE_SYSCALL_VOW_UNIX},
{EXILE_SYS(getsockopt), EXILE_SYSCALL_VOW_INET|EXILE_SYSCALL_VOW_UNIX},
{EXILE_SYS(clone), EXILE_SYSCALL_VOW_CLONE|EXILE_SYSCALL_VOW_THREAD},
{EXILE_SYS(fork), EXILE_SYSCALL_VOW_CLONE},
{EXILE_SYS(vfork), EXILE_SYSCALL_VOW_CLONE},
{EXILE_SYS(execve), EXILE_SYSCALL_VOW_EXEC},
{EXILE_SYS(exit), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(wait4), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(kill), EXILE_SYSCALL_VOW_PROC},
{EXILE_SYS(uname), EXILE_SYSCALL_VOW_PROC},
{EXILE_SYS(semget), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(semop), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(semctl), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(shmdt), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(msgget), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(msgsnd), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(msgrcv), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(msgctl), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(fcntl), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(flock), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(fsync), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(fdatasync), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(truncate), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(ftruncate), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getdents), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(getcwd), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(chdir), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(fchdir), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(rename), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(mkdir), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(rmdir), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(creat), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(link), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(unlink), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(symlink), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(readlink), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(chmod), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(fchmod), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(chown), EXILE_SYSCALL_VOW_CHOWN},
{EXILE_SYS(fchown), EXILE_SYSCALL_VOW_CHOWN},
{EXILE_SYS(lchown), EXILE_SYSCALL_VOW_CHOWN},
{EXILE_SYS(umask), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(gettimeofday), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getrlimit), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getrusage), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(sysinfo), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(times), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getuid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getgid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(setuid), EXILE_SYSCALL_VOW_ID},
{EXILE_SYS(setgid), EXILE_SYSCALL_VOW_ID},
{EXILE_SYS(geteuid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getegid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(setpgid), EXILE_SYSCALL_VOW_PROC},
{EXILE_SYS(getppid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getpgrp), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(setsid), EXILE_SYSCALL_VOW_PROC},
{EXILE_SYS(setreuid), EXILE_SYSCALL_VOW_ID},
{EXILE_SYS(setregid), EXILE_SYSCALL_VOW_ID},
{EXILE_SYS(getgroups), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(setgroups), EXILE_SYSCALL_VOW_ID},
{EXILE_SYS(setresuid), EXILE_SYSCALL_VOW_ID},
{EXILE_SYS(getresuid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(setresgid), EXILE_SYSCALL_VOW_ID},
{EXILE_SYS(getresgid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getpgid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(setfsuid), EXILE_SYSCALL_VOW_ID},
{EXILE_SYS(setfsgid), EXILE_SYSCALL_VOW_ID},
{EXILE_SYS(getsid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(capget), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(rt_sigpending), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(rt_sigtimedwait), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(rt_sigqueueinfo), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(rt_sigsuspend), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(utime), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(mknod), EXILE_SYSCALL_VOW_DPATH},
{EXILE_SYS(uselib), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(ustat), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(statfs), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(fstatfs), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(getpriority), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(setpriority), EXILE_SYSCALL_VOW_SCHED|EXILE_SYSCALL_VOW_PROC},
{EXILE_SYS(sched_setparam), EXILE_SYSCALL_VOW_SCHED},
{EXILE_SYS(sched_getparam), EXILE_SYSCALL_VOW_SCHED},
{EXILE_SYS(sched_setscheduler), EXILE_SYSCALL_VOW_SCHED},
{EXILE_SYS(sched_getscheduler), EXILE_SYSCALL_VOW_SCHED},
{EXILE_SYS(sched_get_priority_max), EXILE_SYSCALL_VOW_SCHED},
{EXILE_SYS(sched_get_priority_min), EXILE_SYSCALL_VOW_SCHED},
{EXILE_SYS(sched_rr_get_interval), EXILE_SYSCALL_VOW_SCHED},
{EXILE_SYS(mlock), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(munlock), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(mlockall), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(munlockall), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(vhangup), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(prctl), EXILE_SYSCALL_VOW_STDIO|EXILE_SYSCALL_VOW_PRCTL|EXILE_SYSCALL_VOW_SECCOMP_INSTALL},
{EXILE_SYS(arch_prctl), EXILE_SYSCALL_VOW_STDIO|EXILE_SYSCALL_VOW_PRCTL},
{EXILE_SYS(setrlimit), EXILE_SYSCALL_VOW_PROC},
{EXILE_SYS(sync), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(gettid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(readahead), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(setxattr), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(lsetxattr), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(fsetxattr), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(getxattr), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(lgetxattr), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(fgetxattr), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(listxattr), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(llistxattr), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(flistxattr), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(removexattr), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(lremovexattr), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(fremovexattr), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(tkill), EXILE_SYSCALL_VOW_PROC},
{EXILE_SYS(time), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(futex), EXILE_SYSCALL_VOW_THREAD},
{EXILE_SYS(sched_getaffinity), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(set_thread_area), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(get_thread_area), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(lookup_dcookie), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(epoll_create), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(epoll_ctl_old), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(epoll_wait_old), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(remap_file_pages), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getdents64), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(set_tid_address), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(semtimedop), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(fadvise64), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(timer_create), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(timer_settime), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(timer_gettime), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(timer_getoverrun), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(timer_delete), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(clock_gettime), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(clock_getres), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(clock_nanosleep), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(exit_group), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(epoll_wait), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(epoll_ctl), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(tgkill), EXILE_SYSCALL_VOW_PROC},
{EXILE_SYS(utimes), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(mbind), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(get_mempolicy), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(mq_open), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(mq_unlink), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(mq_timedsend), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(mq_timedreceive), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(mq_notify), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(mq_getsetattr), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(waitid), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(inotify_init), EXILE_SYSCALL_VOW_FSNOTIFY},
{EXILE_SYS(inotify_add_watch), EXILE_SYSCALL_VOW_FSNOTIFY},
{EXILE_SYS(inotify_rm_watch), EXILE_SYSCALL_VOW_FSNOTIFY},
{EXILE_SYS(openat), EXILE_SYSCALL_VOW_RPATH|EXILE_SYSCALL_VOW_WPATH},
{EXILE_SYS(mkdirat), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(mknodat), EXILE_SYSCALL_VOW_DPATH},
{EXILE_SYS(fchownat), EXILE_SYSCALL_VOW_CHOWN},
{EXILE_SYS(futimesat), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(newfstatat), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(unlinkat), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(renameat), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(linkat), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(symlinkat), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(readlinkat), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(fchmodat), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(faccessat), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(pselect6), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(ppoll), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(set_robust_list), EXILE_SYSCALL_VOW_THREAD},
{EXILE_SYS(get_robust_list), EXILE_SYSCALL_VOW_THREAD},
{EXILE_SYS(splice), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(tee), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(sync_file_range), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(vmsplice), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(move_pages), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(utimensat), EXILE_SYSCALL_VOW_FATTR},
{EXILE_SYS(epoll_pwait), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(signalfd), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(timerfd_create), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(eventfd), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(fallocate), EXILE_SYSCALL_VOW_WPATH|EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(timerfd_settime), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(timerfd_gettime), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(accept4), EXILE_SYSCALL_VOW_UNIX|EXILE_SYSCALL_VOW_INET},
{EXILE_SYS(signalfd4), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(eventfd2), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(epoll_create1), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(dup3), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(pipe2), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(inotify_init1), EXILE_SYSCALL_VOW_FSNOTIFY},
{EXILE_SYS(preadv), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(pwritev), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(recvmmsg), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(fanotify_init), EXILE_SYSCALL_VOW_FSNOTIFY},
{EXILE_SYS(fanotify_mark), EXILE_SYSCALL_VOW_FSNOTIFY},
{EXILE_SYS(prlimit64), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(open_by_handle_at), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(sendmmsg), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(getcpu), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(sched_setattr), EXILE_SYSCALL_VOW_SCHED},
{EXILE_SYS(sched_getattr), EXILE_SYSCALL_VOW_SCHED},
{EXILE_SYS(renameat2), EXILE_SYSCALL_VOW_CPATH},
{EXILE_SYS(getrandom), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(memfd_create), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(execveat), EXILE_SYSCALL_VOW_EXEC},
{EXILE_SYS(mlock2), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(copy_file_range), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(statx), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(rseq), EXILE_SYSCALL_VOW_THREAD},
{EXILE_SYS(clone3), EXILE_SYSCALL_VOW_CLONE|EXILE_SYSCALL_VOW_THREAD},
{EXILE_SYS(close_range), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(openat2), EXILE_SYSCALL_VOW_RPATH|EXILE_SYSCALL_VOW_WPATH},
{EXILE_SYS(faccessat2), EXILE_SYSCALL_VOW_RPATH},
{EXILE_SYS(process_madvise), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(epoll_pwait2), EXILE_SYSCALL_VOW_STDIO},
{EXILE_SYS(futex_waitv), EXILE_SYSCALL_VOW_THREAD}
};
struct str_to_vow_map str_to_vow_map[] =
{
{ "chown", EXILE_SYSCALL_VOW_CHOWN},
{ "clone", EXILE_SYSCALL_VOW_CLONE},
{ "cpath", EXILE_SYSCALL_VOW_CPATH},
{ "dpath", EXILE_SYSCALL_VOW_DPATH},
{ "exec", EXILE_SYSCALL_VOW_EXEC},
{ "fattr", EXILE_SYSCALL_VOW_FATTR},
{ "fsnotify", EXILE_SYSCALL_VOW_FSNOTIFY},
{ "id", EXILE_SYSCALL_VOW_ID},
{ "inet", EXILE_SYSCALL_VOW_INET},
{ "ioctl", EXILE_SYSCALL_VOW_IOCTL},
{ "prctl", EXILE_SYSCALL_VOW_PRCTL},
{ "proc", EXILE_SYSCALL_VOW_PROC},
{ "prot_exec", EXILE_SYSCALL_VOW_PROT_EXEC},
{ "rpath", EXILE_SYSCALL_VOW_RPATH},
{ "sched", EXILE_SYSCALL_VOW_SCHED},
{ "seccomp_install", EXILE_SYSCALL_VOW_SECCOMP_INSTALL},
{ "shm", EXILE_SYSCALL_VOW_SHM},
{ "stdio", EXILE_SYSCALL_VOW_STDIO},
{ "thread", EXILE_SYSCALL_VOW_THREAD},
{ "unix", EXILE_SYSCALL_VOW_UNIX},
{ "wpath", EXILE_SYSCALL_VOW_WPATH},
{ "error", EXILE_SYSCALL_VOW_DENY_ERROR}
};
/* Converts the whitespace separated vows strings to vows flags
*
* This mainly helps readability, as lots of flags ORed together is not
* very readable.
*
* If an unkown string is found, abort() is called.
*/
uint64_t exile_vows_from_str(const char *str)
{
uint64_t result = 0;
char current[64] = { 0 };
char *ptr = current;
const char *end = ptr + sizeof(current)-1;
do
{
while(ptr <= end && *str != '\0' && *str != ' ')
{
*ptr = *str;
++ptr;
++str;
}
int found = 0;
for(size_t i = 0; i < sizeof(str_to_vow_map)/sizeof(str_to_vow_map[0]); i++)
{
if(strcmp(str_to_vow_map[i].str, current) == 0)
{
result |= str_to_vow_map[i].value;
found = 1;
break;
}
}
if(!found)
{
EXILE_LOG_ERROR("No such vow: %s\n", current);
abort();
}
memset(current, 0, sizeof(current));
ptr = current;
} while(*str++ != '\0');
return result;
}
inline int exile_landlock_is_available()
{
#if HAVE_LANDLOCK == 1
int ruleset = landlock_create_ruleset(NULL, 0, LANDLOCK_CREATE_RULESET_VERSION);
return ruleset > 0;
#endif
return 0;
}
int exile_append_syscall_policy(struct exile_policy *exile_policy, long syscall, unsigned int syscall_policy, struct sock_filter *argfilters, size_t n)
{
struct exile_syscall_policy *newpolicy = (struct exile_syscall_policy *) calloc(1, sizeof(struct exile_syscall_policy));
if(newpolicy == NULL)
{
EXILE_LOG_ERROR("Failed to allocate memory for syscall policy\n");
exile_policy->exile_flags |= EXILE_FLAG_ADD_SYSCALL_POLICY_FAIL;
return -1;
}
newpolicy->policy = syscall_policy;
newpolicy->syscall = syscall;
newpolicy->argfilterscount = n;
if(n > EXILE_ARGFILTERS_COUNT)
{
EXILE_LOG_ERROR("Too many argfilters supplied\n");
exile_policy->exile_flags |= EXILE_FLAG_ADD_SYSCALL_POLICY_FAIL;
free(newpolicy);
return -1;
}
for(size_t i = 0; i < n; i++)
{
newpolicy->argfilters[i] = argfilters[i];
}
newpolicy->next = NULL;
*(exile_policy->syscall_policies_tail) = newpolicy;
exile_policy->syscall_policies_tail = &(newpolicy->next);
exile_policy->disable_syscall_filter = 0;
return 0;
}
int exile_append_syscall_default_policy(struct exile_policy *exile_policy, unsigned int default_policy)
{
return exile_append_syscall_policy(exile_policy, EXILE_SYSCALL_MATCH_ALL, default_policy, NULL, 0);
}
#define COUNT_EXILE_SYSCALL_FILTER(f) \
sizeof(f)/sizeof(f[0])
#define EXILE_SYSCALL_FILTER_LOAD_ARG(val) \
{ 0, EXILE_BPF_LOAD_SECCOMP_ARG(val), 0}
/* Returns, for the specific syscall, the correct sock_filter struct for the provided vow_promises
*
* Returns: 0 if none copied, otherwise the number of entries in "filter".
*/
int get_vow_argfilter(long syscall, uint64_t vow_promises, struct sock_filter *filter , int *policy)
{
/* How to read this:
* Keep in mind our default action is to deny, unless it's a syscall from a vow promise. Then it will be
* accepted if the argument values are good (if we care about them at all).
* EXILE_BPF_MATCH() means the argument value is good, and the syscall can be accepted without further checks
* EXILE_BPF_NO_MATCH() means the syscall won't be allowed because the value is illegal
*
* First field (vowmask): The mask to check
* Last field (whenset): If mask is set in vow_promises, then add this filter, otherwise don't.
*/
struct exile_syscall_filter mmap_filter[] = {
EXILE_SYSCALL_FILTER_LOAD_ARG(2),
{ EXILE_SYSCALL_VOW_PROT_EXEC, EXILE_BPF_NO_MATCH_SET(PROT_EXEC), 0},
};
struct exile_syscall_filter ioctl_filter[] = {
EXILE_SYSCALL_FILTER_LOAD_ARG(1),
{ EXILE_SYSCALL_VOW_IOCTL, EXILE_BPF_NO_MATCH_SET(TIOCSTI), 1 },
{ EXILE_SYSCALL_VOW_IOCTL, EXILE_BPF_RETURN_MATCHING, 1 },
{ EXILE_SYSCALL_VOW_STDIO, EXILE_BPF_MATCH(FIONREAD), 1},
{ EXILE_SYSCALL_VOW_STDIO, EXILE_BPF_MATCH(FIONBIO), 1},
{ EXILE_SYSCALL_VOW_STDIO, EXILE_BPF_MATCH(FIONREAD), 1},
{ EXILE_SYSCALL_VOW_STDIO, EXILE_BPF_MATCH(FIOCLEX), 1},
{ EXILE_SYSCALL_VOW_STDIO, EXILE_BPF_MATCH(FIONCLEX), 1},
{ EXILE_SYSCALL_VOW_STDIO, EXILE_BPF_RETURN_NOT_MATCHING, 1}
};
struct exile_syscall_filter open_filter[] = {
EXILE_SYSCALL_FILTER_LOAD_ARG(1),
{ EXILE_SYSCALL_VOW_CPATH, EXILE_BPF_NO_MATCH_SET(O_CREAT), 0 },
{ EXILE_SYSCALL_VOW_WPATH, EXILE_BPF_NO_MATCH_SET(O_TMPFILE),0 },
{ EXILE_SYSCALL_VOW_WPATH, EXILE_BPF_NO_MATCH_SET(O_WRONLY),0 },
{ EXILE_SYSCALL_VOW_WPATH, EXILE_BPF_NO_MATCH_SET(O_RDWR),0 },
{ EXILE_SYSCALL_VOW_WPATH, EXILE_BPF_NO_MATCH_SET(O_APPEND),0 },
};
struct exile_syscall_filter socket_filter[] = {
EXILE_SYSCALL_FILTER_LOAD_ARG(0),
{ EXILE_SYSCALL_VOW_UNIX, EXILE_BPF_MATCH(AF_UNIX), 1 },
{ EXILE_SYSCALL_VOW_INET, EXILE_BPF_MATCH(AF_INET), 1 },
{ EXILE_SYSCALL_VOW_INET, EXILE_BPF_MATCH(AF_INET6), 1 },
{ 0, EXILE_BPF_RETURN_NOT_MATCHING, 0}
};
struct exile_syscall_filter setsockopt_filter[] = {
EXILE_SYSCALL_FILTER_LOAD_ARG(2),
{ 0, EXILE_BPF_NO_MATCH(SO_DEBUG), 0 },
{ 0, EXILE_BPF_NO_MATCH(SO_SNDBUFFORCE), 0 }
};
struct exile_syscall_filter clone_filter[] = {
/* It's the first (0) argument for x86_64 */
EXILE_SYSCALL_FILTER_LOAD_ARG(0),
{ EXILE_SYSCALL_VOW_CLONE, EXILE_BPF_RETURN_MATCHING, 1 },
{ EXILE_SYSCALL_VOW_THREAD, EXILE_BPF_CMP_SET(CLONE_VM, 0, EXILE_SYSCALL_EXIT_BPF_NO_MATCH), 1},
{ EXILE_SYSCALL_VOW_THREAD, EXILE_BPF_CMP_SET(CLONE_THREAD, 0, EXILE_SYSCALL_EXIT_BPF_NO_MATCH), 1},
{ 0, EXILE_BPF_NO_MATCH_SET(CLONE_NEWCGROUP), 0},
{ 0, EXILE_BPF_NO_MATCH_SET(CLONE_NEWIPC),0},
{ 0, EXILE_BPF_NO_MATCH_SET(CLONE_NEWNET),0},
{ 0, EXILE_BPF_NO_MATCH_SET(CLONE_NEWNS),0},
{ 0, EXILE_BPF_NO_MATCH_SET(CLONE_NEWPID),0},
{ 0, EXILE_BPF_NO_MATCH_SET(CLONE_NEWUSER),0},
{ 0, EXILE_BPF_NO_MATCH_SET(CLONE_NEWUTS),0},
};
struct exile_syscall_filter prctl_filter[] ={
EXILE_SYSCALL_FILTER_LOAD_ARG(0),
{ EXILE_SYSCALL_VOW_PRCTL, EXILE_BPF_RETURN_MATCHING, 1},
{ EXILE_SYSCALL_VOW_SECCOMP_INSTALL, EXILE_BPF_MATCH(PR_SET_SECCOMP), 1 },
{ EXILE_SYSCALL_VOW_STDIO, EXILE_BPF_MATCH(PR_SET_NO_NEW_PRIVS),1},
{ EXILE_SYSCALL_VOW_STDIO, EXILE_BPF_MATCH(PR_GET_NO_NEW_PRIVS),1},
{ EXILE_SYSCALL_VOW_STDIO, EXILE_BPF_MATCH(PR_GET_NAME),1},
{ EXILE_SYSCALL_VOW_STDIO, EXILE_BPF_MATCH(PR_SET_NAME),1},
{ EXILE_SYSCALL_VOW_STDIO, EXILE_BPF_MATCH(PR_CAPBSET_READ), 1},
{ 0, EXILE_BPF_RETURN_NOT_MATCHING, 0}
};
struct exile_syscall_filter *current_filter = NULL;
size_t current_count = 0;
*policy = EXILE_SYSCALL_ALLOW;
switch(syscall)
{
case EXILE_SYS(mmap):
case EXILE_SYS(mprotect):
current_filter = mmap_filter;
current_count = COUNT_EXILE_SYSCALL_FILTER(mmap_filter);
break;
case EXILE_SYS(ioctl):
current_filter = ioctl_filter;
current_count = COUNT_EXILE_SYSCALL_FILTER(ioctl_filter);
break;
case EXILE_SYS(open):
case EXILE_SYS(openat):
case EXILE_SYS(open_by_handle_at):
if(syscall == EXILE_SYS(openat) || syscall == EXILE_SYS(open_by_handle_at))
{
/* for openat, it's the third arg */
open_filter[0] = (struct exile_syscall_filter) EXILE_SYSCALL_FILTER_LOAD_ARG(2);
}
current_filter = open_filter;
current_count = COUNT_EXILE_SYSCALL_FILTER(open_filter);
break;
case EXILE_SYS(openat2):
*policy = EXILE_SYSCALL_DENY_RET_NOSYS;
return 0;
break;
case EXILE_SYS(socket):
current_filter = socket_filter;
current_count = COUNT_EXILE_SYSCALL_FILTER(socket_filter);
break;
case EXILE_SYS(setsockopt):
current_filter = setsockopt_filter;
current_count = COUNT_EXILE_SYSCALL_FILTER(setsockopt_filter);
break;
case EXILE_SYS(clone):
current_filter = clone_filter;
current_count = COUNT_EXILE_SYSCALL_FILTER(clone_filter);
break;
case EXILE_SYS(clone3):
if((vow_promises & EXILE_SYSCALL_VOW_CLONE) == 0)
{
*policy = EXILE_SYSCALL_DENY_RET_NOSYS;
return 0;
}
break;
case EXILE_SYS(prctl):
current_filter = prctl_filter;
current_count = COUNT_EXILE_SYSCALL_FILTER(prctl_filter);
break;
}
int out_filter_index = 0;
for(size_t i = 0; i < current_count; i++)
{
struct exile_syscall_filter *c = ¤t_filter[i];
int set = 0;
if(c->vowmask & vow_promises)
{
set = 1;
}
if(c->whenset == set || c->vowmask == 0)
{
filter[out_filter_index++] = c->filter;
}
}
return out_filter_index;
}
int exile_append_vow_promises(struct exile_policy *policy, uint64_t vow_promises)
{
for(unsigned int i = 0; i < sizeof(exile_vow_map)/sizeof(exile_vow_map[0]); i++)
{
struct syscall_vow_map *current_map = &exile_vow_map[i];
if(current_map->vowmask & vow_promises)
{
struct sock_filter filter[EXILE_ARGFILTERS_COUNT];
long syscall = current_map->syscall;
int syscall_policy = EXILE_SYSCALL_ALLOW;
int argfilters = get_vow_argfilter(syscall, vow_promises, filter, &syscall_policy);
int ret = exile_append_syscall_policy(policy, syscall, syscall_policy, filter, argfilters);
if(ret != 0)
{
EXILE_LOG_ERROR("Failed adding syscall policy from vow while processing %li\n", syscall);
return ret;
}
}
}
int vow_policy = (vow_promises & EXILE_SYSCALL_VOW_DENY_ERROR) ? EXILE_SYSCALL_DENY_RET_ERROR : EXILE_SYSCALL_DENY_KILL_PROCESS;
return exile_append_syscall_default_policy(policy, vow_policy);
}
/* Creates an empty policy struct without opinionated defaults.
*
* Must be freed using exile_free_policy()
* @returns: empty policy
*/
struct exile_policy *exile_create_policy()
{
struct exile_policy *result = (struct exile_policy *) calloc(1, sizeof(struct exile_policy));
if(result == NULL)
{
EXILE_LOG_ERROR("Failed to allocate memory for policy\n");
return NULL;
}
result->path_policies_tail = &(result->path_policies);
result->syscall_policies_tail = &(result->syscall_policies);
return result;
}
/* Creates the default policy
* Must be freed using exile_free_policy()
*
* @returns: default policy
*/
struct exile_policy *exile_init_policy()
{
struct exile_policy *result = exile_create_policy();
if(result == NULL)
{
return NULL;
}
result->drop_caps = 0;
result->not_dumpable = 1;
result->no_new_privs = 1;
result->namespace_options = EXILE_UNSHARE_AUTOMATIC;
result->namespace_uid = 0;
result->namespace_gid = 0;
return result;
}
/* Appends path policies to the exile_policy object
* The last paramater must be NULL
*
* This function does not copy parameters. All passed paths
* MUST NOT be freed until exile_enable_policy() is called!
*
* @returns: 0 on success, -1 on failure */
int (exile_append_path_policies)(struct exile_policy *exile_policy, unsigned int path_policy, ...)
{
va_list args;
const char *path;
va_start(args, path_policy);
path = va_arg(args, char*);
while(path != NULL)
{
int fd = open(path, O_PATH);
if(fd == -1)
{
EXILE_LOG_ERROR("Failed to open %s: %s\n", path, strerror(errno));
exile_policy->exile_flags |= EXILE_FLAG_ADD_PATH_POLICY_FAIL;
return -1;
}
close(fd);
struct exile_path_policy *newpolicy = (struct exile_path_policy *) calloc(1, sizeof(struct exile_path_policy));
if(newpolicy == NULL)
{
EXILE_LOG_ERROR("Failed to allocate memory for path policy\n");
exile_policy->exile_flags |= EXILE_FLAG_ADD_PATH_POLICY_FAIL;
return -1;
}
newpolicy->path = path;
newpolicy->policy = path_policy;
newpolicy->next = NULL;
*(exile_policy->path_policies_tail) = newpolicy;
exile_policy->path_policies_tail = &(newpolicy->next);
path = va_arg(args, char*);
}
va_end(args);
return 0;
}
/*
* Fills buffer with random characters a-z.
* The string will be null terminated.
*
* @returns: number of written chars (excluding terminating null byte) on success
*/
int random_string(char *buffer, size_t buffer_length)
{
int r = getrandom(buffer, buffer_length-1, GRND_NONBLOCK);
if(r != -1 && (size_t) r == buffer_length-1)
{
int i = 0;
while(i < r)
{
buffer[i] = 'a' + ((unsigned int)buffer[i] % 26);
++i;
}
buffer[buffer_length-1] = '\0';
return i;
}
return 0;
}
/* Creates a directory/file and all necessary parent directories
* @returns: 0 on success, -ERRNO on failure
*/
int mkpath(const char *p, mode_t mode, int baseisfile)
{
char path[PATH_MAX + 1] = {0};
int ret = snprintf(path, sizeof(path), "%s%c", p, (baseisfile) ? '\0' : '/');
if(ret < 0)
{
EXILE_LOG_ERROR("error during path concatination\n");
return -EINVAL;
}
if((size_t)ret >= sizeof(path))
{
EXILE_LOG_ERROR("path concatination truncated\n");
return -EINVAL;
}
char *begin = path;
char *end = begin + 1;
while(*end)
{
if(*end == '/')
{
*end = 0;
if(mkdir(begin, mode) < 0)
{
if(errno != EEXIST)
{
EXILE_LOG_ERROR("Failed to create directory: %s\n", begin);
return -1;
}
}
*end = '/';
while(*end == '/')
{
++end;
}
}
else
{
++end;
}
}
if(baseisfile)
{
ret = creat(p, mode);
if(ret == -1)
{
EXILE_LOG_ERROR("Failed to create file: %s\n", begin);
return ret;
}
close(ret);
return 0;
}
return 0;
}
/* @returns: argument for mount(2) flags */
static int get_policy_mount_flags(struct exile_path_policy *policy)
{
int result = 0;
if( (policy->policy & EXILE_FS_ALLOW_DEV) == 0)
{
result |= MS_NODEV;
}
if( (policy->policy & EXILE_FS_ALLOW_EXEC) == 0)
{
result |= MS_NOEXEC;
}
if( (policy->policy & EXILE_FS_ALLOW_SETUID) == 0)
{
result |= MS_NOSUID;
}
if( (policy->policy & EXILE_FS_ALLOW_ALL_WRITE) == 0)
{
result |= MS_RDONLY;
}
if( (policy->policy & EXILE_MOUNT_NOT_REC) == 0)
{
result |= MS_REC;
}
return result;
}
int path_policy_needs_landlock(struct exile_path_policy *path_policy)
{
unsigned int policy = path_policy->policy;
#if HAVE_LANDLOCK == 1
if(policy >= EXILE_FS_ALLOW_REMOVE_DIR)
{
return 1;
}
#endif
//Can't need it if we don't have support at compile time
return 0;
}
/* TODO: we can do va_args */
char *concat_path(const char *first, const char *second)
{
char *result = (char *) calloc(1, PATH_MAX);
if(result == NULL)
{
EXILE_LOG_ERROR("calloc failed\n");
return NULL;
}
//TODO: We can strip multiple redundant slashes
int written = snprintf(result, PATH_MAX, "%s/%s", first, second);
if(written < 0)
{
EXILE_LOG_ERROR("Error during path concatination\n");
free(result);
return NULL;
}
if(written >= PATH_MAX)
{
EXILE_LOG_ERROR("path concatination truncated\n");
free(result);
return NULL;
}
return result;
}
/* Creates the file system hierarchy for the chroot
* @returns: 0 on sucess, -ERRNO on failure */
static int create_chroot_dirs(const char *chroot_target_path, struct exile_path_policy *path_policy)
{
while(path_policy != NULL)
{
struct stat sb;
int ret = stat(path_policy->path, &sb);
if(ret < 0)
{
EXILE_LOG_ERROR("stat failed\n");
return ret;
}
int baseisfile = 0;
if(S_ISREG(sb.st_mode))
{
baseisfile = 1;
}
char *path_inside_chroot = concat_path(chroot_target_path, path_policy->path);
if(path_inside_chroot == NULL)
{
return 1;
}
ret = mkpath(path_inside_chroot, 0700, baseisfile);
if(ret < 0)
{
EXILE_LOG_ERROR("Error creating directory structure %s while mounting paths to chroot: %s\n", path_inside_chroot, strerror(errno));
free(path_inside_chroot);
return ret;
}
path_policy = path_policy->next;
free(path_inside_chroot);
}
return 0;
}
static int perform_mounts(const char *chroot_target_path, struct exile_path_policy *path_policy)
{
while(path_policy != NULL)
{
if(path_policy->policy & EXILE_FS_ALLOW_ALL_READ || path_policy->policy & EXILE_FS_ALLOW_ALL_WRITE)
{
int mount_flags = get_policy_mount_flags(path_policy);
char *path_inside_chroot = concat_path(chroot_target_path, path_policy->path);
if(path_inside_chroot == NULL)
{
return 1;
}
//all we do is bind mounts
mount_flags |= MS_BIND;
int ret = mount(path_policy->path, path_inside_chroot, NULL, mount_flags, NULL);
if(ret < 0 )
{
EXILE_LOG_ERROR("Failed to mount %s to %s: %s\n", path_policy->path, path_inside_chroot, strerror(errno));
free(path_inside_chroot);
return ret;
}
//remount so noexec, readonly etc. take effect
ret = mount(NULL, path_inside_chroot, NULL, mount_flags | MS_REMOUNT, NULL);
if(ret < 0 )
{
EXILE_LOG_ERROR("Failed to remount %s: %s\n", path_inside_chroot, strerror(errno));
free(path_inside_chroot);
return ret;
}
free(path_inside_chroot);
}
path_policy = path_policy->next;
}
return 0;
}
/*
* Frees the memory taken by a exile_policy object
*/
void exile_free_policy(struct exile_policy *ctxt)
{
if(ctxt != NULL)
{
struct exile_path_policy *current = ctxt->path_policies;
while(current != NULL)
{
struct exile_path_policy *tmp = current;
current = current->next;
free(tmp);
}
struct exile_syscall_policy *sc_policy = ctxt->syscall_policies;
while(sc_policy != NULL)
{
struct exile_syscall_policy *tmp = sc_policy;
sc_policy = sc_policy->next;
free(tmp);
}
free(ctxt);
}
}
/* Enters the specified namespaces */
static int enter_namespaces(int namespace_options, uid_t namespace_uid, gid_t namespace_gid)
{
if(namespace_options & EXILE_UNSHARE_USER)
{
uid_t current_uid = getuid();
gid_t current_gid = getgid();
char buf[1024] = {0};
int ret = unshare(CLONE_NEWUSER);
if(ret == -1)
{
EXILE_LOG_ERROR("Failed to unshare user namespaces: %s\n", strerror(errno));
return ret;
}
int fd = open("/proc/self/setgroups", O_WRONLY);
if(fd == -1)
{
EXILE_LOG_ERROR("Failed to open /proc/self/setgroups for writing\n");
return -1;
}
int writesize = snprintf(buf, sizeof(buf), "deny");
int writeret = write(fd, buf, writesize);
if(writeret < 0 || writeret < writesize)
{
EXILE_LOG_ERROR("Failed to write to /proc/self/setgroups: %i (%s)\n", writeret, strerror(errno));
return -1;
}
close(fd);
fd = open("/proc/self/uid_map", O_WRONLY);
if(fd == -1)
{
EXILE_LOG_ERROR("Failed to open /proc/self/uid_map for writing\n");
return -1;
}
writesize = snprintf(buf, sizeof(buf), "%u %u 1\n", namespace_uid, current_uid);
writeret = write(fd, buf, writesize);
if(writeret < 0 || writeret < writesize)
{
EXILE_LOG_ERROR("Failed to write to /proc/self/uid_map: %i (%s)\n", writeret, strerror(errno));
return -1;
}
close(fd);
fd = open("/proc/self/gid_map", O_WRONLY);
if(fd == -1)
{
EXILE_LOG_ERROR("Failed to open /proc/self/gid_map for writing\n");
return -1;
}
writesize = snprintf(buf, sizeof(buf), "%u %u 1\n", namespace_gid, current_gid);
writeret = write(fd, buf, writesize);
if(writeret < 0 || writeret < writesize)
{
EXILE_LOG_ERROR("Failed to write to /proc/self/gid_map: %i (%s)\n", writeret, strerror(errno));