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/*
* seccomp support for Linux kernel using seccomp
*
* Copyright (c) 2016 Paul Wouters <pwouters@redhat.com>
*
* 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. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* 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.
*/
#include <stddef.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include "lswseccomp.h"
#include "defs.h"
#include "log.h"
#include "pluto_seccomp.h"
/* helper rules must be a sub-set of main rules */
static void init_seccomp(uint32_t def_action, bool main, struct logger *logger)
{
scmp_filter_ctx ctx = seccomp_init(def_action);
if (ctx == NULL) {
/* no error code!?! */
fatal(PLUTO_EXIT_SECCOMP_FAIL, logger, "seccomp_init() failed!");
}
/*
* read() and wait4() take the vast majority of syscall time
* So we place these at the head of the list for performance
* example strace -c -f output if pluto:
*
* % time seconds usecs/call calls errors syscall
* ------ ----------- ----------- --------- --------- ----------------
* 73.70 41.137940 1202 34232 343 read
* 20.77 11.595734 3549 3267 1176 wait4
* 1.47 0.819570 709 1156 epoll_wait
* 0.60 0.332147 1 319902 rt_sigprocmask
* 0.55 0.307552 5 61578 mmap
* 0.41 0.230820 6 37788 2877 open
* [...]
*/
LSW_SECCOMP_ADD(read);
if (main) {
LSW_SECCOMP_ADD(wait4);
}
/* needed for pluto and updown, not helpers */
if (main) {
LSW_SECCOMP_ADD(_llseek);
LSW_SECCOMP_ADD(accept);
LSW_SECCOMP_ADD(access);
LSW_SECCOMP_ADD(bind);
LSW_SECCOMP_ADD(brk);
LSW_SECCOMP_ADD(chdir);
LSW_SECCOMP_ADD(clone);
#if SCMP_SYS(clone3)
LSW_SECCOMP_ADD(clone3);
#endif
LSW_SECCOMP_ADD(connect);
LSW_SECCOMP_ADD(copy_file_range);
LSW_SECCOMP_ADD(dup);
LSW_SECCOMP_ADD(dup2);
LSW_SECCOMP_ADD(dup3);
LSW_SECCOMP_ADD(epoll_create);
LSW_SECCOMP_ADD(epoll_create1);
LSW_SECCOMP_ADD(epoll_ctl);
LSW_SECCOMP_ADD(epoll_pwait);
LSW_SECCOMP_ADD(epoll_wait);
LSW_SECCOMP_ADD(execve);
LSW_SECCOMP_ADD(faccessat);
#if SCMP_SYS(faccessat2)
LSW_SECCOMP_ADD(faccessat2);
#endif
LSW_SECCOMP_ADD(fadvise64);
LSW_SECCOMP_ADD(getcwd);
LSW_SECCOMP_ADD(getdents);
LSW_SECCOMP_ADD(getdents64);
LSW_SECCOMP_ADD(getegid);
LSW_SECCOMP_ADD(geteuid);
LSW_SECCOMP_ADD(getgid);
LSW_SECCOMP_ADD(getgroups);
LSW_SECCOMP_ADD(get_mempolicy);
LSW_SECCOMP_ADD(getpgid);
LSW_SECCOMP_ADD(getpgrp);
LSW_SECCOMP_ADD(getppid);
LSW_SECCOMP_ADD(getrandom); /* for unbound */
LSW_SECCOMP_ADD(getrlimit);
LSW_SECCOMP_ADD(getsockname);
LSW_SECCOMP_ADD(getsockopt);
LSW_SECCOMP_ADD(getuid);
LSW_SECCOMP_ADD(ioctl);
LSW_SECCOMP_ADD(lstat);
LSW_SECCOMP_ADD(listen);
LSW_SECCOMP_ADD(mkdir);
LSW_SECCOMP_ADD(munmap);
LSW_SECCOMP_ADD(open);
LSW_SECCOMP_ADD(pipe);
LSW_SECCOMP_ADD(pipe2);
LSW_SECCOMP_ADD(poll);
LSW_SECCOMP_ADD(ppoll);
LSW_SECCOMP_ADD(prctl);
LSW_SECCOMP_ADD(prlimit64);
LSW_SECCOMP_ADD(pselect6);
LSW_SECCOMP_ADD(readlink);
LSW_SECCOMP_ADD(readlinkat);
LSW_SECCOMP_ADD(recvfrom);
LSW_SECCOMP_ADD(recvmsg);
#if SCMP_SYS(rseq)
LSW_SECCOMP_ADD(rseq);
#endif
LSW_SECCOMP_ADD(sched_getaffinity);
LSW_SECCOMP_ADD(select);
LSW_SECCOMP_ADD(sendmmsg);
LSW_SECCOMP_ADD(sendmsg);
LSW_SECCOMP_ADD(set_mempolicy);
LSW_SECCOMP_ADD(set_robust_list);
LSW_SECCOMP_ADD(setsockopt);
LSW_SECCOMP_ADD(socket);
LSW_SECCOMP_ADD(socketcall);
LSW_SECCOMP_ADD(socketpair);
LSW_SECCOMP_ADD(sysinfo);
LSW_SECCOMP_ADD(uname);
LSW_SECCOMP_ADD(unlink);
LSW_SECCOMP_ADD(unlinkat);
}
/* common to pluto and helpers */
LSW_SECCOMP_ADD(arch_prctl);
LSW_SECCOMP_ADD(clock_gettime);
LSW_SECCOMP_ADD(close);
LSW_SECCOMP_ADD(exit);
LSW_SECCOMP_ADD(exit_group);
LSW_SECCOMP_ADD(fcntl);
LSW_SECCOMP_ADD(fstat);
LSW_SECCOMP_ADD(futex);
LSW_SECCOMP_ADD(getpid);
LSW_SECCOMP_ADD(gettid);
LSW_SECCOMP_ADD(gettimeofday);
LSW_SECCOMP_ADD(lseek);
LSW_SECCOMP_ADD(madvise);
LSW_SECCOMP_ADD(mmap);
LSW_SECCOMP_ADD(mprotect);
LSW_SECCOMP_ADD(nanosleep);
LSW_SECCOMP_ADD(newfstatat);
LSW_SECCOMP_ADD(openat);
LSW_SECCOMP_ADD(pread64);
LSW_SECCOMP_ADD(rt_sigaction);
LSW_SECCOMP_ADD(rt_sigprocmask);
LSW_SECCOMP_ADD(rt_sigreturn);
LSW_SECCOMP_ADD(sched_setparam);
LSW_SECCOMP_ADD(send);
LSW_SECCOMP_ADD(sendto);
LSW_SECCOMP_ADD(set_tid_address);
LSW_SECCOMP_ADD(sigaltstack);
LSW_SECCOMP_ADD(sigreturn);
LSW_SECCOMP_ADD(stat);
LSW_SECCOMP_ADD(statfs);
LSW_SECCOMP_ADD(statfs64);
LSW_SECCOMP_ADD(waitpid);
LSW_SECCOMP_ADD(write);
int rc = seccomp_load(ctx);
if (rc < 0) {
seccomp_release(ctx);
fatal_errno(PLUTO_EXIT_SECCOMP_FAIL, logger, -rc,
"seccomp_load() failed");
}
}
void init_seccomp_main(struct logger *logger)
{
switch (pluto_seccomp_mode) {
case SECCOMP_ENABLED:
init_seccomp(SCMP_ACT_KILL, true, logger);
llog(RC_LOG, logger, "seccomp security enabled in strict mode");
break;
case SECCOMP_TOLERANT:
init_seccomp(SCMP_ACT_TRAP, true, logger);
llog(RC_LOG, logger, "seccomp security enabled in tolerant mode");
break;
case SECCOMP_DISABLED:
/*
* XXX: not "is disabled" it makes it sound that
* something active was done when nothing was.
*/
llog(RC_LOG, logger, "seccomp security is not enabled");
break;
default:
bad_case(pluto_seccomp_mode);
}
}
void init_seccomp_cryptohelper(int helpernum, struct logger *logger)
{
switch (pluto_seccomp_mode) {
case SECCOMP_ENABLED:
init_seccomp(SCMP_ACT_KILL, false, logger);
llog(RC_LOG, logger, "seccomp security enabled in strict mode for crypto helper %d", helpernum);
break;
case SECCOMP_TOLERANT:
init_seccomp(SCMP_ACT_TRAP, false, logger);
llog(RC_LOG, logger, "seccomp security enabled in tolerant mode for crypto helper %d", helpernum);
break;
case SECCOMP_DISABLED:
/*
* XXX: see above; also skip log as not helpful.
*/
ldbg(logger, "seccomp security is not enabled for crypto helper %d", helpernum);
break;
default:
bad_case(pluto_seccomp_mode);
}
}
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