exile.h/test.c
Albert S db17e58deb Assign syscalls into groups. Add whitelist mode (default).
Classify syscalls into groups, for x86_64 only for now.
Up to date for 5.15, generate some #ifndef for syscalls
introduced since 5.10. Only support x86_64 therefore at this point.

Switch from blacklisting to a default whitelist.
2021-11-14 21:46:47 +01:00

336 lines
6.9 KiB
C

#include "qssb.h"
#include <stdbool.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
int xqssb_enable_policy(struct qssb_policy *policy)
{
int ret = qssb_enable_policy(policy);
if(ret != 0)
{
fprintf(stderr, "qssb_enable_policy() failed: %i\n", ret);
exit(EXIT_FAILURE);
}
return 0;
}
int test_default_main()
{
struct qssb_policy *policy = qssb_init_policy();
int ret = qssb_enable_policy(policy);
return ret;
}
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 qssb_policy *policy = qssb_init_policy();
qssb_append_syscall_policy(policy, QSSB_SYSCALL_DENY_KILL_PROCESS, QSSB_SYS(getuid));
qssb_append_syscall_default_policy(policy, QSSB_SYSCALL_ALLOW);
xqssb_enable_policy(policy);
uid_t pid = geteuid();
pid = getuid();
return 0;
}
int test_seccomp_blacklisted()
{
return test_expected_kill(&do_test_seccomp_blacklisted);
}
static int do_test_seccomp_blacklisted_call_permitted()
{
struct qssb_policy *policy = qssb_init_policy();
qssb_append_syscall_policy(policy, QSSB_SYSCALL_DENY_KILL_PROCESS, QSSB_SYS(getuid));
qssb_append_syscall_default_policy(policy, QSSB_SYSCALL_ALLOW);
int ret = qssb_enable_policy(policy);
//geteuid is not blacklisted, so must succeed
uid_t pid = 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 qssb_policy *policy = qssb_init_policy();
qssb_append_syscall_policy(policy, QSSB_SYSCALL_DENY_KILL_PROCESS, QSSB_SYS(getuid));
qssb_append_syscall_default_policy(policy, QSSB_SYSCALL_ALLOW);
xqssb_enable_policy(policy);
/* Attempt to bypass by falling back to x32 should be blocked */
syscall(QSSB_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 qssb_policy *policy = qssb_init_policy();
qssb_append_syscall_policy(policy, QSSB_SYSCALL_DENY_KILL_PROCESS, QSSB_SYS(getuid));
int status = qssb_enable_policy(policy);
if(status == 0)
{
printf("Failed. Should not have been enabled!");
return 1;
}
return 0;
}
static int do_test_seccomp_errno()
{
struct qssb_policy *policy = qssb_init_policy();
qssb_append_syscall_policy(policy, QSSB_SYSCALL_DENY_RET_ERROR, QSSB_SYS(close));
qssb_append_syscall_default_policy(policy, QSSB_SYSCALL_ALLOW);
xqssb_enable_policy(policy);
uid_t id = getuid();
int fd = 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);
}
static int test_seccomp_group()
{
struct qssb_policy *policy = qssb_init_policy();
qssb_append_group_syscall_policy(policy, QSSB_SYSCALL_DENY_RET_ERROR, QSSB_SYSCGROUP_SOCKET);
qssb_append_syscall_default_policy(policy, QSSB_SYSCALL_ALLOW);
xqssb_enable_policy(policy);
int s = socket(AF_INET,SOCK_STREAM,0);
if(s != -1)
{
printf("Failed: socket was expected to return error\n");
return 1;
}
return 0;
}
int test_landlock()
{
struct qssb_policy *policy = qssb_init_policy();
qssb_append_path_policy(policy, QSSB_FS_ALLOW_READ, "/proc/self/fd");
int ret = qssb_enable_policy(policy);
int fd = open("/", O_RDONLY | O_CLOEXEC);
if(fd < 0)
{
return 0;
}
return 1;
}
int test_landlock_deny_write()
{
struct qssb_policy *policy = qssb_init_policy();
qssb_append_path_policy(policy, QSSB_FS_ALLOW_READ, "/tmp/");
int ret = qssb_enable_policy(policy);
int fd = open("/tmp/a", O_WRONLY | O_CLOEXEC);
if(fd < 0)
{
return 0;
}
return 1;
}
int test_nofs()
{
struct qssb_policy *policy = qssb_init_policy();
policy->no_fs = 1;
int ret = qssb_enable_policy(policy);
if(ret != 0)
{
fprintf(stderr, "Failed to activate nofs sandbox\n");
return -1;
}
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 qssb_policy *policy = qssb_init_policy();
policy->no_new_fds = 1;
int ret = qssb_enable_policy(policy);
if(ret != 0)
{
fprintf(stderr, "Failed to activate no_new_fd sandbox\n");
return -1;
}
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-group", &test_seccomp_group},
{ "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;
}