Albert S
55b43fdaac
Among other differences, pledge() from OpenBSD takes a string and has exec promises. We don't. Using the same name yet providing a different interface does not appear reasonable.
542 рядки
12 KiB
C
542 рядки
12 KiB
C
#include "exile.h"
|
|
#include <stdbool.h>
|
|
#include <sys/types.h>
|
|
#include <dirent.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/wait.h>
|
|
|
|
int xexile_enable_policy(struct exile_policy *policy)
|
|
{
|
|
int ret = exile_enable_policy(policy);
|
|
if(ret != 0)
|
|
{
|
|
fprintf(stderr, "exile_enable_policy() failed: %i\n", ret);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int test_default_main()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
return xexile_enable_policy(policy);
|
|
}
|
|
|
|
static int test_expected_kill(int (*f)())
|
|
{
|
|
pid_t pid = fork();
|
|
if(pid == 0)
|
|
{
|
|
return f();
|
|
}
|
|
int status = 0;
|
|
waitpid(pid, &status, 0);
|
|
|
|
if(WIFSIGNALED(status))
|
|
{
|
|
int c = WTERMSIG(status);
|
|
if(c == SIGSYS)
|
|
{
|
|
printf("Got expected signal\n");
|
|
return 0;
|
|
}
|
|
printf("Unexpected status code: %i\n", c);
|
|
return 1;
|
|
}
|
|
else
|
|
{
|
|
int c = WEXITSTATUS(status);
|
|
printf("Process was not killed, test fails. Status code of exit: %i\n", c);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int test_successful_exit(int (*f)())
|
|
{
|
|
pid_t pid = fork();
|
|
if(pid == 0)
|
|
{
|
|
return f();
|
|
}
|
|
int status = 0;
|
|
waitpid(pid, &status, 0);
|
|
|
|
if(WIFSIGNALED(status))
|
|
{
|
|
int c = WTERMSIG(status);
|
|
printf("Received signal, which was not expected. Signal was: %i\n", c);
|
|
return 1;
|
|
}
|
|
else
|
|
{
|
|
int c = WEXITSTATUS(status);
|
|
if(c != 0)
|
|
{
|
|
printf("Process failed to exit properly. Status code is: %i\n", c);
|
|
}
|
|
return c;
|
|
}
|
|
printf("Process exited sucessfully as expected");
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int do_test_seccomp_blacklisted()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
exile_append_syscall_policy(policy,EXILE_SYS(getuid), EXILE_SYSCALL_DENY_KILL_PROCESS, NULL, 0);
|
|
exile_append_syscall_default_policy(policy, EXILE_SYSCALL_ALLOW);
|
|
|
|
xexile_enable_policy(policy);
|
|
|
|
uid_t pid = syscall(EXILE_SYS(geteuid));
|
|
pid = syscall(EXILE_SYS(getuid));
|
|
return 0;
|
|
|
|
|
|
}
|
|
int test_seccomp_blacklisted()
|
|
{
|
|
return test_expected_kill(&do_test_seccomp_blacklisted);
|
|
}
|
|
|
|
|
|
static int do_test_seccomp_blacklisted_call_permitted()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
|
|
exile_append_syscall_policy(policy, EXILE_SYS(getuid), EXILE_SYSCALL_DENY_KILL_PROCESS, NULL, 0);
|
|
exile_append_syscall_default_policy(policy, EXILE_SYSCALL_ALLOW);
|
|
|
|
xexile_enable_policy(policy);
|
|
//geteuid is not blacklisted, so must succeed
|
|
uid_t pid = syscall(EXILE_SYS(geteuid));
|
|
return 0;
|
|
}
|
|
|
|
|
|
int test_seccomp_blacklisted_call_permitted()
|
|
{
|
|
return test_successful_exit(&do_test_seccomp_blacklisted_call_permitted);
|
|
}
|
|
|
|
static int do_test_seccomp_x32_kill()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
|
|
exile_append_syscall_policy(policy, EXILE_SYS(getuid), EXILE_SYSCALL_DENY_KILL_PROCESS, NULL, 0);
|
|
exile_append_syscall_default_policy(policy, EXILE_SYSCALL_ALLOW);
|
|
|
|
xexile_enable_policy(policy);
|
|
|
|
/* Attempt to bypass by falling back to x32 should be blocked */
|
|
syscall(EXILE_SYS(getuid)+__X32_SYSCALL_BIT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int test_seccomp_x32_kill()
|
|
{
|
|
return test_expected_kill(&do_test_seccomp_x32_kill);
|
|
}
|
|
|
|
/* Tests whether seccomp rules end with a policy matching all syscalls */
|
|
int test_seccomp_require_last_matchall()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
|
|
exile_append_syscall_policy(policy, EXILE_SYS(getuid), EXILE_SYSCALL_DENY_KILL_PROCESS, NULL, 0);
|
|
|
|
int status = exile_enable_policy(policy);
|
|
if(status == 0)
|
|
{
|
|
printf("Failed. Should not have been enabled!");
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int do_test_seccomp_errno()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
|
|
exile_append_syscall_policy(policy, EXILE_SYS(close),EXILE_SYSCALL_DENY_RET_ERROR, NULL, 0);
|
|
exile_append_syscall_default_policy(policy, EXILE_SYSCALL_ALLOW);
|
|
|
|
xexile_enable_policy(policy);
|
|
uid_t id = syscall(EXILE_SYS(getuid));
|
|
|
|
int fd = syscall(EXILE_SYS(close), 0);
|
|
printf("close() return code: %i, errno: %s\n", fd, strerror(errno));
|
|
return fd == -1 ? 0 : 1;
|
|
}
|
|
|
|
|
|
|
|
int test_seccomp_errno()
|
|
{
|
|
return test_successful_exit(&do_test_seccomp_errno);
|
|
}
|
|
|
|
int test_seccomp_argfilter_allowed()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
|
|
struct sock_filter argfilter[2] =
|
|
{
|
|
BPF_STMT(BPF_LD+BPF_W+BPF_ABS, (offsetof(struct seccomp_data, args[1]))),
|
|
BPF_JUMP(BPF_JMP+BPF_JSET+BPF_K, O_WRONLY, 0, EXILE_SYSCALL_EXIT_BPF_NO_MATCH)
|
|
};
|
|
|
|
exile_append_syscall_policy(policy, EXILE_SYS(open),EXILE_SYSCALL_DENY_RET_ERROR, argfilter, 2);
|
|
exile_append_syscall_default_policy(policy, EXILE_SYSCALL_ALLOW);
|
|
xexile_enable_policy(policy);
|
|
|
|
|
|
char *t = "/dev/random";
|
|
int ret = (int) syscall(EXILE_SYS(open),t, O_RDONLY);
|
|
|
|
if(ret == -1)
|
|
{
|
|
printf("Failed: open was expected to succeed, but returned %i\n", ret);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int test_seccomp_argfilter_filtered()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
|
|
struct sock_filter argfilter[2] =
|
|
{
|
|
BPF_STMT(BPF_LD+BPF_W+BPF_ABS, (offsetof(struct seccomp_data, args[1]))),
|
|
BPF_JUMP(BPF_JMP+BPF_JSET+BPF_K, O_WRONLY, 0, EXILE_SYSCALL_EXIT_BPF_NO_MATCH)
|
|
};
|
|
|
|
exile_append_syscall_policy(policy, EXILE_SYS(open),EXILE_SYSCALL_DENY_RET_ERROR, argfilter, 2);
|
|
exile_append_syscall_default_policy(policy, EXILE_SYSCALL_ALLOW);
|
|
xexile_enable_policy(policy);
|
|
|
|
char *t = "/dev/random";
|
|
int ret = (int) syscall(EXILE_SYS(open),t, O_WRONLY);
|
|
|
|
if(ret != -1)
|
|
{
|
|
printf("Failed: open was expected to fail, but returned %i\n", ret);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
int test_seccomp_argfilter_mixed()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
|
|
struct sock_filter argfilter[2] =
|
|
{
|
|
BPF_STMT(BPF_LD+BPF_W+BPF_ABS, (offsetof(struct seccomp_data, args[1]))),
|
|
BPF_JUMP(BPF_JMP+BPF_JSET+BPF_K, O_WRONLY, 0, EXILE_SYSCALL_EXIT_BPF_NO_MATCH)
|
|
};
|
|
|
|
exile_append_syscall_policy(policy, EXILE_SYS(stat),EXILE_SYSCALL_DENY_RET_ERROR, NULL,0);
|
|
exile_append_syscall_policy(policy, EXILE_SYS(open),EXILE_SYSCALL_DENY_RET_ERROR, argfilter, 2);
|
|
exile_append_syscall_policy(policy, EXILE_SYS(getpid),EXILE_SYSCALL_DENY_RET_ERROR, NULL, 0);
|
|
|
|
exile_append_syscall_default_policy(policy, EXILE_SYSCALL_ALLOW);
|
|
xexile_enable_policy(policy);
|
|
|
|
struct stat statbuf;
|
|
int s = (int) syscall(EXILE_SYS(stat), "/dev/urandom", &statbuf);
|
|
if(s != -1)
|
|
{
|
|
printf("Failed: stat was expected to fail, but returned %i\n", s);
|
|
return 1;
|
|
}
|
|
|
|
pid_t p = (pid_t) syscall(EXILE_SYS(getpid));
|
|
if(p != -1)
|
|
{
|
|
printf("Failed: getpid was expected to fail, but returned %i\n", p);
|
|
return 1;
|
|
}
|
|
|
|
char *t = "/dev/random";
|
|
int ret = (int) syscall(EXILE_SYS(open),t, O_WRONLY);
|
|
if(ret != -1)
|
|
{
|
|
printf("Failed: open was expected to fail, but returned %i\n", ret);
|
|
return 1;
|
|
}
|
|
ret = (int) syscall(EXILE_SYS(open), t, O_RDONLY);
|
|
if(ret == -1)
|
|
{
|
|
printf("Failed: open with O_RDONLY was expected to succeed, but returned %i\n", ret);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
int do_test_seccomp_vow_socket()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
policy->vow_promises = EXILE_SYSCALL_VOW_STDIO | EXILE_SYSCALL_VOW_INET | EXILE_SYSCALL_VOW_DENY_ERROR;
|
|
xexile_enable_policy(policy);
|
|
|
|
int s = socket(AF_INET, SOCK_STREAM, 0);
|
|
if(s == -1)
|
|
{
|
|
printf("Failed: socket was expected to succeed, but returned %i\n", s);
|
|
return 1;
|
|
}
|
|
s = socket(AF_UNIX, SOCK_DGRAM, 0);
|
|
if(s != -1)
|
|
{
|
|
printf("Failed: socket was expected to fail, but returned %i\n", s);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int do_test_seccomp_vow_open()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
policy->vow_promises = EXILE_SYSCALL_VOW_STDIO | EXILE_SYSCALL_VOW_RPATH | EXILE_SYSCALL_VOW_DENY_ERROR;
|
|
xexile_enable_policy(policy);
|
|
|
|
int ret = open("/dev/urandom", O_WRONLY | O_APPEND);
|
|
if(ret != -1)
|
|
{
|
|
printf("Failed: open was expected to fail, but returned %i\n", ret);
|
|
return 1;
|
|
}
|
|
ret = open("/dev/urandom", O_RDWR);
|
|
if(ret != -1)
|
|
{
|
|
printf("Failed: open O_RDWR was expected to fail, but returned %i\n", ret);
|
|
return 1;
|
|
}
|
|
ret = open("/dev/urandom", O_RDONLY);
|
|
if(ret == -1)
|
|
{
|
|
printf("Failed: open was expected to succceed, but returned %i\n", ret);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int test_seccomp_vow()
|
|
{
|
|
int ret = test_successful_exit(&do_test_seccomp_vow_open);
|
|
if(ret != 0)
|
|
{
|
|
printf("Failed: do_test_seccomp_vow_open()\n");
|
|
return 1;
|
|
}
|
|
ret = test_successful_exit(&do_test_seccomp_vow_socket);
|
|
if(ret != 0)
|
|
{
|
|
printf("Failed: do_test_seccomp_vow_socket()\n");
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int test_seccomp_exile_vow_multiple()
|
|
{
|
|
|
|
int ret = exile_vow(EXILE_SYSCALL_VOW_STDIO | EXILE_SYSCALL_VOW_UNIX | EXILE_SYSCALL_VOW_SECCOMP_INSTALL | EXILE_SYSCALL_VOW_DENY_ERROR);
|
|
if(ret != 0)
|
|
{
|
|
printf("Failed: exile_vow() call 1 failed\n");
|
|
return 1;
|
|
}
|
|
int s = socket(AF_UNIX, SOCK_STREAM, 0);
|
|
if(s == -1)
|
|
{
|
|
printf("Failed: socket was expected to succeed, but returned %i\n", s);
|
|
return 1;
|
|
}
|
|
|
|
/* Let's take away unix sockets, so it should not be possible anymore */
|
|
ret = exile_vow(EXILE_SYSCALL_VOW_STDIO | EXILE_SYSCALL_VOW_SECCOMP_INSTALL | EXILE_SYSCALL_VOW_DENY_ERROR);
|
|
if(ret != 0)
|
|
{
|
|
printf("Failed: exile_vow() call 2 failed\n");
|
|
return 1;
|
|
}
|
|
s = socket(AF_UNIX, SOCK_STREAM, 0);
|
|
if(s != -1)
|
|
{
|
|
printf("Failed: socket was expected to fail, but returned %i\n", s);
|
|
return 1;
|
|
}
|
|
|
|
/* Let's try to regain unix sockets again */
|
|
ret = exile_vow(EXILE_SYSCALL_VOW_STDIO | EXILE_SYSCALL_VOW_UNIX | EXILE_SYSCALL_VOW_SECCOMP_INSTALL | EXILE_SYSCALL_VOW_DENY_ERROR);
|
|
if(ret != 0)
|
|
{
|
|
printf("Failed: exile_vow() call 3 failed\n");
|
|
return 1;
|
|
}
|
|
s = socket(AF_UNIX, SOCK_STREAM, 0);
|
|
if(s != -1)
|
|
{
|
|
printf("Failed: socket was still expected to fail, but returned %i\n", s);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
#if HAVE_LANDLOCK == 1
|
|
int test_landlock()
|
|
{
|
|
if(!exile_landlock_is_available())
|
|
{
|
|
printf("landlock not available, so cannot test\n");
|
|
return 1;
|
|
}
|
|
struct exile_policy *policy = exile_init_policy();
|
|
exile_append_path_policy(policy, EXILE_FS_ALLOW_ALL_READ, "/proc/self/fd");
|
|
xexile_enable_policy(policy);
|
|
|
|
int fd = open("/", O_RDONLY | O_CLOEXEC);
|
|
if(fd < 0)
|
|
{
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int test_landlock_deny_write()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
exile_append_path_policy(policy, EXILE_FS_ALLOW_ALL_READ, "/tmp/");
|
|
xexile_enable_policy(policy);
|
|
|
|
int fd = open("/tmp/a", O_WRONLY | O_CLOEXEC);
|
|
if(fd < 0)
|
|
{
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
#else
|
|
int test_landlock()
|
|
{
|
|
return 2;
|
|
}
|
|
|
|
int test_landlock_deny_write()
|
|
{
|
|
return 2;
|
|
}
|
|
#endif
|
|
|
|
int test_nofs()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
policy->no_fs = 1;
|
|
xexile_enable_policy(policy);
|
|
|
|
int s = socket(AF_INET,SOCK_STREAM,0);
|
|
if(s == -1)
|
|
{
|
|
fprintf(stderr, "Failed to open socket but this was not requested by policy\n");
|
|
return 1;
|
|
}
|
|
|
|
/* Expect seccomp to take care of this */
|
|
if(open("/test", O_CREAT | O_WRONLY) >= 0)
|
|
{
|
|
fprintf(stderr, "Failed: We do not expect write access\n");
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int test_no_new_fds()
|
|
{
|
|
struct exile_policy *policy = exile_init_policy();
|
|
policy->no_new_fds = 1;
|
|
xexile_enable_policy(policy);
|
|
|
|
if(open("/tmp/test", O_CREAT | O_WRONLY) >= 0)
|
|
{
|
|
fprintf(stderr, "Failed: Could open new file descriptor\n");
|
|
return -1;
|
|
}
|
|
|
|
int s = socket(AF_INET,SOCK_STREAM,0);
|
|
if(s >= 0)
|
|
{
|
|
fprintf(stderr, "Failed: socket got opened but policy denied\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
struct dispatcher
|
|
{
|
|
char *name;
|
|
int (*f)();
|
|
};
|
|
|
|
struct dispatcher dispatchers[] = {
|
|
{ "default", &test_default_main },
|
|
{ "seccomp-blacklisted", &test_seccomp_blacklisted},
|
|
{ "seccomp-blacklisted-permitted", &test_seccomp_blacklisted_call_permitted},
|
|
{ "seccomp-x32-kill", &test_seccomp_x32_kill},
|
|
{ "seccomp-require-last-matchall", &test_seccomp_require_last_matchall},
|
|
{ "seccomp-errno", &test_seccomp_errno},
|
|
{ "seccomp-argfilter-allowed", &test_seccomp_argfilter_allowed},
|
|
{ "seccomp-argfilter-filtered", &test_seccomp_argfilter_filtered},
|
|
{ "seccomp-argfilter-mixed", &test_seccomp_argfilter_mixed},
|
|
{ "seccomp-vow", &test_seccomp_vow},
|
|
{ "seccomp-vow-exile_vow-multi", &test_seccomp_exile_vow_multiple},
|
|
{ "landlock", &test_landlock},
|
|
{ "landlock-deny-write", &test_landlock_deny_write },
|
|
{ "no_fs", &test_nofs},
|
|
{ "no_new_fds", &test_no_new_fds}
|
|
};
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
if(argc < 2)
|
|
{
|
|
fprintf(stderr, "Usage: %s [testname]\n", argv[0]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
char *test = argv[1];
|
|
if(strcmp(test, "--dumptests") == 0)
|
|
{
|
|
for(unsigned int i = 0; i < sizeof(dispatchers)/sizeof(dispatchers[0]); i++)
|
|
{
|
|
printf("%s\n", dispatchers[i].name);
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
for(unsigned int i = 0; i < sizeof(dispatchers)/sizeof(dispatchers[0]); i++)
|
|
{
|
|
struct dispatcher *current = &dispatchers[i];
|
|
if(strcmp(current->name, test) == 0)
|
|
{
|
|
return current->f();
|
|
}
|
|
}
|
|
fprintf(stderr, "Unknown test\n");
|
|
return EXIT_FAILURE;
|
|
}
|