|
Packit Service |
4684c1 |
/*
|
|
Packit Service |
4684c1 |
* Copyright (C) 2013 Nikos Mavrogiannopoulos
|
|
Packit Service |
4684c1 |
*
|
|
Packit Service |
4684c1 |
* This file is part of GnuTLS test suite.
|
|
Packit Service |
4684c1 |
*
|
|
Packit Service |
4684c1 |
* ocserv is free software: you can redistribute it and/or modify it
|
|
Packit Service |
4684c1 |
* under the terms of the GNU General Public License as published by
|
|
Packit Service |
4684c1 |
* the Free Software Foundation, either version 2 of the License, or
|
|
Packit Service |
4684c1 |
* (at your option) any later version.
|
|
Packit Service |
4684c1 |
*
|
|
Packit Service |
4684c1 |
* ocserv is distributed in the hope that it will be useful, but
|
|
Packit Service |
4684c1 |
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit Service |
4684c1 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit Service |
4684c1 |
* General Public License for more details.
|
|
Packit Service |
4684c1 |
*
|
|
Packit Service |
4684c1 |
* You should have received a copy of the GNU General Public License
|
|
Packit Service |
4684c1 |
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
Packit Service |
4684c1 |
*/
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
#include <config.h>
|
|
Packit Service |
4684c1 |
#include <stdio.h>
|
|
Packit Service |
4684c1 |
#include "utils.h"
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
#ifdef HAVE_LIBSECCOMP
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
#include <seccomp.h>
|
|
Packit Service |
4684c1 |
#include <errno.h>
|
|
Packit Service |
4684c1 |
#include <string.h>
|
|
Packit Service |
4684c1 |
#if defined(__linux__)
|
|
Packit Service |
4684c1 |
# include <sys/syscall.h>
|
|
Packit Service |
4684c1 |
#endif
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
int disable_system_calls(void)
|
|
Packit Service |
4684c1 |
{
|
|
Packit Service |
4684c1 |
int ret;
|
|
Packit Service |
4684c1 |
scmp_filter_ctx ctx;
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
/*ctx = seccomp_init(SCMP_ACT_ERRNO(EPERM));*/
|
|
Packit Service |
4684c1 |
ctx = seccomp_init(SCMP_ACT_TRAP);
|
|
Packit Service |
4684c1 |
if (ctx == NULL) {
|
|
Packit Service |
4684c1 |
fprintf(stderr, "could not initialize seccomp");
|
|
Packit Service |
4684c1 |
return -1;
|
|
Packit Service |
4684c1 |
}
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
#define ADD_SYSCALL(name, ...) \
|
|
Packit Service |
4684c1 |
ret = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(name), __VA_ARGS__); \
|
|
Packit Service |
4684c1 |
/* libseccomp returns EDOM for pseudo-syscalls due to a bug */ \
|
|
Packit Service |
4684c1 |
if (ret < 0 && ret != -EDOM) { \
|
|
Packit Service |
4684c1 |
fprintf(stderr, "could not add " #name " to seccomp filter: %s", strerror(-ret)); \
|
|
Packit Service |
4684c1 |
ret = -1; \
|
|
Packit Service |
4684c1 |
goto fail; \
|
|
Packit Service |
4684c1 |
}
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(nanosleep, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(time, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(getpid, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(gettimeofday, 0);
|
|
Packit Service |
4684c1 |
#if defined(HAVE_CLOCK_GETTIME)
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(clock_gettime, 0);
|
|
Packit Service |
4684c1 |
#endif
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(getrusage, 0);
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
/* recv/send for the default pull/push functions. It is unknown
|
|
Packit Service |
4684c1 |
* which syscall is used by libc and varies from system to system
|
|
Packit Service |
4684c1 |
* so we enable all */
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(recvmsg, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(sendmsg, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(send, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(recv, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(sendto, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(recvfrom, 0);
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
/* to read from /dev/urandom */
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(read, 0);
|
|
Packit Service |
4684c1 |
#ifdef SYS_getrandom
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(getrandom, 0);
|
|
Packit Service |
4684c1 |
#endif
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
/* we use it in select */
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(sigprocmask, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(rt_sigprocmask, 0);
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
/* used in to detect reading timeouts */
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(poll, 0);
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
/* for memory allocation */
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(brk, 0);
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
/* the following are for generic operations, not specific to
|
|
Packit Service |
4684c1 |
* gnutls. */
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(close, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(exit, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(exit_group, 0);
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
/* allow returning from signal handlers */
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(sigreturn, 0);
|
|
Packit Service |
4684c1 |
ADD_SYSCALL(rt_sigreturn, 0);
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
ret = seccomp_load(ctx);
|
|
Packit Service |
4684c1 |
if (ret < 0) {
|
|
Packit Service |
4684c1 |
fprintf(stderr, "could not load seccomp filter");
|
|
Packit Service |
4684c1 |
ret = -1;
|
|
Packit Service |
4684c1 |
goto fail;
|
|
Packit Service |
4684c1 |
}
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
ret = 0;
|
|
Packit Service |
4684c1 |
|
|
Packit Service |
4684c1 |
fail:
|
|
Packit Service |
4684c1 |
seccomp_release(ctx);
|
|
Packit Service |
4684c1 |
return ret;
|
|
Packit Service |
4684c1 |
}
|
|
Packit Service |
4684c1 |
#else
|
|
Packit Service |
4684c1 |
int disable_system_calls(void)
|
|
Packit Service |
4684c1 |
{
|
|
Packit Service |
4684c1 |
return 0;
|
|
Packit Service |
4684c1 |
}
|
|
Packit Service |
4684c1 |
#endif
|