/
waive.c
312 lines (270 loc) · 9.59 KB
/
waive.c
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/*
* this file is part of libwaive.
*
* Copyright (c) 2015 Dima Krasner
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <sys/socket.h>
#include <sys/mman.h>
#include <errno.h>
#include <stddef.h>
#include <unistd.h>
#include <sys/syscall.h>
#ifdef __NR_socketcall
# include <linux/net.h>
#endif
#include <seccomp.h>
#include "waive.h"
int waive(const int flags)
{
scmp_filter_ctx ctx;
int ret = -1;
ctx = seccomp_init(SCMP_ACT_ALLOW);
if (NULL == ctx)
goto out;
if (0 != (WAIVE_SOCKET & flags)) {
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(socket),
0))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(socketpair),
0))
goto release;
}
else {
if (0 != (WAIVE_INET & flags)) {
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(socket),
1,
SCMP_A0(SCMP_CMP_EQ, AF_INET)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(socket),
1,
SCMP_A0(SCMP_CMP_EQ, AF_INET6)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(socketpair),
1,
SCMP_A0(SCMP_CMP_EQ, AF_INET)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(socketpair),
1,
SCMP_A0(SCMP_CMP_EQ, AF_INET6)))
goto release;
}
if (0 != (WAIVE_UN & flags)) {
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(socket),
1,
SCMP_A0(SCMP_CMP_EQ, AF_UNIX)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(socketpair),
1,
SCMP_A0(SCMP_CMP_EQ, AF_UNIX)))
goto release;
}
if (0 != (WAIVE_PACKET & flags)) {
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(socket),
1,
SCMP_A0(SCMP_CMP_EQ, AF_PACKET)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(socketpair),
1,
SCMP_A0(SCMP_CMP_EQ, AF_PACKET)))
goto release;
}
}
if (0 != (WAIVE_MOUNT & flags)) {
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mount),
0))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(umount),
0))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(umount2),
0))
goto release;
}
if (0 != (WAIVE_OPEN & flags)) {
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(open),
0))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(openat),
0))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(creat),
0))
goto release;
}
if (0 != (WAIVE_EXEC & flags)) {
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(execve),
0))
goto release;
#ifdef __NR_execveat
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(execveat),
0))
goto release;
#endif
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mprotect),
1,
SCMP_A2(SCMP_CMP_EQ, PROT_EXEC)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mprotect),
1,
SCMP_A2(SCMP_CMP_EQ, PROT_READ | PROT_EXEC)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mprotect),
1,
SCMP_A2(SCMP_CMP_EQ, PROT_WRITE | PROT_EXEC)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mprotect),
1,
SCMP_A2(SCMP_CMP_EQ,
PROT_READ | PROT_WRITE | PROT_EXEC)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mmap),
1,
SCMP_A2(SCMP_CMP_EQ, PROT_READ | PROT_EXEC)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mmap),
1,
SCMP_A2(SCMP_CMP_EQ, PROT_WRITE | PROT_EXEC)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mmap),
1,
SCMP_A2(SCMP_CMP_EQ,
PROT_READ | PROT_WRITE | PROT_EXEC)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mmap2),
1,
SCMP_A2(SCMP_CMP_EQ, PROT_WRITE | PROT_EXEC)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mmap2),
1,
SCMP_A2(SCMP_CMP_EQ,
PROT_READ | PROT_WRITE | PROT_EXEC)))
goto release;
}
if (0 != (WAIVE_CLONE & flags)) {
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(clone),
0))
goto release;
}
if (0 != (WAIVE_KILL & flags)) {
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(kill),
1,
SCMP_A0(SCMP_CMP_NE, 0)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(tkill),
1,
SCMP_A0(SCMP_CMP_NE, 0)))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(tgkill),
1,
SCMP_A0(SCMP_CMP_NE, 0)))
goto release;
}
if (0 != (WAIVE_PIPE & flags)) {
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(pipe),
0))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(pipe2),
0))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mknod),
0))
goto release;
if (0 != seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(EPERM),
SCMP_SYS(mknodat),
0))
goto release;
}
if (0 == seccomp_load(ctx))
ret = 0;
release:
seccomp_release(ctx);
out:
return ret;
}