mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
198 lines
7 KiB
C
198 lines
7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2022 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or 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 "libc/calls/calls.h"
|
|
#include "libc/calls/landlock.h"
|
|
#include "libc/calls/struct/dirent.h"
|
|
#include "libc/calls/struct/stat.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/intrin/kprintf.h"
|
|
#include "libc/mem/io.h"
|
|
#include "libc/runtime/gc.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/stdio/stdio.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/consts/o.h"
|
|
#include "libc/sysv/consts/s.h"
|
|
#include "libc/testlib/testlib.h"
|
|
#include "libc/x/x.h"
|
|
|
|
STATIC_YOINK("zip_uri_support");
|
|
|
|
#define EACCES_OR_ENOENT (IsOpenbsd() ? ENOENT : EACCES)
|
|
|
|
#define SPAWN() \
|
|
{ \
|
|
int ws, pid; \
|
|
ASSERT_NE(-1, (pid = fork())); \
|
|
if (!pid) {
|
|
|
|
#define EXITS(rc) \
|
|
_Exit(0); \
|
|
} \
|
|
ASSERT_NE(-1, wait(&ws)); \
|
|
ASSERT_TRUE(WIFEXITED(ws)); \
|
|
ASSERT_EQ(rc, WEXITSTATUS(ws)); \
|
|
}
|
|
|
|
char testlib_enable_tmp_setup_teardown;
|
|
|
|
struct stat st;
|
|
|
|
static bool SupportsLandlock(void) {
|
|
int e = errno;
|
|
bool r = landlock_create_ruleset(0, 0, LANDLOCK_CREATE_RULESET_VERSION) >= 0;
|
|
errno = e;
|
|
return r;
|
|
}
|
|
|
|
__attribute__((__constructor__)) static void init(void) {
|
|
if (!(IsLinux() && SupportsLandlock()) && !IsOpenbsd()) exit(0);
|
|
}
|
|
|
|
void SetUp(void) {
|
|
// make sure zipos maps executable into memory early
|
|
ASSERT_SYS(0, 0, stat("/zip/life.elf", &st));
|
|
}
|
|
|
|
int extract(const char *from, const char *to, int mode) {
|
|
int fdin, fdout;
|
|
if ((fdin = open(from, O_RDONLY)) == -1) return -1;
|
|
if ((fdout = creat(to, mode)) == -1) {
|
|
close(fdin);
|
|
return -1;
|
|
}
|
|
if (_copyfd(fdin, fdout, -1) == -1) {
|
|
close(fdout);
|
|
close(fdin);
|
|
return -1;
|
|
}
|
|
return close(fdout) | close(fdin);
|
|
}
|
|
|
|
TEST(unveil, api_differences) {
|
|
SPAWN();
|
|
ASSERT_SYS(0, 0, stat("/", &st));
|
|
ASSERT_SYS(0, 0, unveil(".", "rw"));
|
|
if (IsOpenbsd()) {
|
|
// openbsd imposes restrictions immediately
|
|
ASSERT_SYS(ENOENT, -1, open("/", O_RDONLY | O_DIRECTORY));
|
|
} else {
|
|
// restrictions on linux don't go into effect until unveil(0,0)
|
|
ASSERT_SYS(0, 3, open("/", O_RDONLY | O_DIRECTORY));
|
|
ASSERT_SYS(0, 0, close(3));
|
|
}
|
|
ASSERT_SYS(0, 0, unveil(0, 0));
|
|
// error numbers are inconsistent
|
|
ASSERT_SYS(EACCES_OR_ENOENT, -1, open("/", O_RDONLY | O_DIRECTORY));
|
|
// wut
|
|
if (IsLinux()) {
|
|
ASSERT_SYS(0, 3, open("/", O_PATH)); // wut
|
|
ASSERT_SYS(0, 0, stat("/", &st)); // wut
|
|
}
|
|
EXITS(0);
|
|
}
|
|
|
|
TEST(unveil, rx_readOnlyPreexistingExecutable_worksFine) {
|
|
SPAWN();
|
|
ASSERT_SYS(0, 0, mkdir("folder", 0755));
|
|
ASSERT_SYS(0, 0, extract("/zip/life.elf", "folder/life.elf", 0755));
|
|
ASSERT_SYS(0, 0, unveil("folder", "rx"));
|
|
ASSERT_SYS(0, 0, unveil(0, 0));
|
|
SPAWN();
|
|
execv("folder/life.elf", (char *[]){"folder/life.elf", 0});
|
|
EXITS(42);
|
|
EXITS(0);
|
|
}
|
|
|
|
TEST(unveil, r_noExecutePreexistingExecutable_raisesEacces) {
|
|
SPAWN();
|
|
ASSERT_SYS(0, 0, mkdir("folder", 0755));
|
|
ASSERT_SYS(0, 0, extract("/zip/life.elf", "folder/life.elf", 0755));
|
|
ASSERT_SYS(0, 0, unveil("folder", "r"));
|
|
ASSERT_SYS(0, 0, unveil(0, 0));
|
|
SPAWN();
|
|
ASSERT_SYS(EACCES, -1,
|
|
execv("folder/life.elf", (char *[]){"folder/life.elf", 0}));
|
|
EXITS(0);
|
|
EXITS(0);
|
|
}
|
|
|
|
TEST(unveil, rwc_createExecutableFile_isAllowedButCantBeRun) {
|
|
SPAWN();
|
|
ASSERT_SYS(0, 0, mkdir("folder", 0755));
|
|
ASSERT_SYS(0, 0, unveil("folder", "rwc"));
|
|
ASSERT_SYS(0, 0, unveil(0, 0));
|
|
ASSERT_SYS(0, 0, extract("/zip/life.elf", "folder/life.elf", 0755));
|
|
SPAWN();
|
|
ASSERT_SYS(0, 0, stat("folder/life.elf", &st));
|
|
ASSERT_SYS(EACCES, -1,
|
|
execv("folder/life.elf", (char *[]){"folder/life.elf", 0}));
|
|
EXITS(0);
|
|
EXITS(0);
|
|
}
|
|
|
|
TEST(unveil, rwcx_createExecutableFile_canAlsoBeRun) {
|
|
SPAWN();
|
|
ASSERT_SYS(0, 0, mkdir("folder", 0755));
|
|
ASSERT_SYS(0, 0, unveil("folder", "rwcx"));
|
|
ASSERT_SYS(0, 0, unveil(0, 0));
|
|
ASSERT_SYS(0, 0, extract("/zip/life.elf", "folder/life.elf", 0755));
|
|
SPAWN();
|
|
ASSERT_SYS(0, 0, stat("folder/life.elf", &st));
|
|
execv("folder/life.elf", (char *[]){"folder/life.elf", 0});
|
|
EXITS(42);
|
|
EXITS(0);
|
|
}
|
|
|
|
TEST(unveil, dirfdHacking_doesntWork) {
|
|
SPAWN();
|
|
ASSERT_SYS(0, 0, mkdir("jail", 0755));
|
|
ASSERT_SYS(0, 0, mkdir("garden", 0755));
|
|
ASSERT_SYS(0, 0, touch("garden/secret.txt", 0644));
|
|
ASSERT_SYS(0, 3, open("garden", O_RDONLY | O_DIRECTORY));
|
|
ASSERT_SYS(0, 0, unveil("jail", "rw"));
|
|
ASSERT_SYS(0, 0, unveil(0, 0));
|
|
ASSERT_SYS(EACCES_OR_ENOENT, -1, openat(3, "secret.txt", O_RDONLY));
|
|
EXITS(0);
|
|
}
|
|
|
|
TEST(unveil, overlappingDirectories_inconsistentBehavior) {
|
|
SPAWN();
|
|
ASSERT_SYS(0, 0, makedirs("f1/f2", 0755));
|
|
ASSERT_SYS(0, 0, extract("/zip/life.elf", "f1/f2/life.elf", 0755));
|
|
ASSERT_SYS(0, 0, unveil("f1", "x"));
|
|
ASSERT_SYS(0, 0, unveil("f1/f2", "r"));
|
|
ASSERT_SYS(0, 0, unveil(0, 0));
|
|
if (IsOpenbsd()) {
|
|
// OpenBSD favors the most restrictive policy
|
|
SPAWN();
|
|
ASSERT_SYS(0, 0, stat("f1/f2/life.elf", &st));
|
|
ASSERT_SYS(EACCES, -1,
|
|
execv("f1/f2/life.elf", (char *[]){"f1/f2/life.elf", 0}));
|
|
EXITS(0);
|
|
} else {
|
|
// Landlock (Linux) uses the union of policies
|
|
SPAWN();
|
|
ASSERT_SYS(0, 0, stat("f1/f2/life.elf", &st));
|
|
execv("f1/f2/life.elf", (char *[]){"f1/f2/life.elf", 0});
|
|
EXITS(42);
|
|
}
|
|
EXITS(0);
|
|
}
|