/* * Ensure that fcntl() works consistently for both regular file descriptors and * capability-wrapped ones. */ int test_fcntl(void) { int success = PASSED; cap_rights_t rights = CAP_READ | CAP_FCNTL; /* * Open some files of different types, and wrap them in capabilities. */ struct fd files[] = { { "file", open("/etc/passwd", O_RDONLY) }, { "socket", socket(PF_LOCAL, SOCK_STREAM, 0) }, { "SHM", shm_open(SHM_ANON, O_RDWR, 0600) }, }; REQUIRE(files[0].f_fd); REQUIRE(files[1].f_fd); REQUIRE(files[2].f_fd); struct fd caps[] = { { "file cap", cap_new(files[0].f_fd, rights) }, { "socket cap", cap_new(files[1].f_fd, rights) }, { "SHM cap", cap_new(files[2].f_fd, rights) }, }; REQUIRE(caps[0].f_fd); REQUIRE(caps[1].f_fd); REQUIRE(caps[2].f_fd); struct fd all[] = { files[0], caps[0], files[1], caps[1], files[2], caps[2], }; const size_t len = sizeof(all) / sizeof(struct fd); REQUIRE(cap_enter()); /* * Ensure that we can fcntl() all the files that we opened above. */ for (size_t i = 0; i < len; i++) { struct fd f = all[i]; int cap; CHECK_SYSCALL_SUCCEEDS(fcntl, f.f_fd, F_GETFL, 0); REQUIRE(cap = cap_new(f.f_fd, CAP_READ)); if (fcntl(f.f_fd, F_GETFL, 0) == -1) FAIL("Error calling fcntl('%s', F_GETFL)", f.f_name); else CHECK_NOTCAPABLE(fcntl, cap, F_GETFL, 0); } return (success); }
int test_capmode(void) { struct statfs statfs; struct stat sb; long sysarch_arg = 0; int fd_close, fd_dir, fd_file, fd_socket, fd2[2]; int success = PASSED; pid_t pid, wpid; char ch; /* Open some files to play with. */ REQUIRE(fd_file = open("/tmp/cap_capmode", O_RDWR|O_CREAT, 0644)); REQUIRE(fd_close = open("/dev/null", O_RDWR)); REQUIRE(fd_dir = open("/tmp", O_RDONLY)); REQUIRE(fd_socket = socket(PF_INET, SOCK_DGRAM, 0)); /* Enter capability mode. */ REQUIRE(cap_enter()); /* * System calls that are not permitted in capability mode. */ CHECK_CAPMODE(access, "/tmp/cap_capmode_access", F_OK); CHECK_CAPMODE(acct, "/tmp/cap_capmode_acct"); CHECK_CAPMODE(bind, PF_INET, NULL, 0); CHECK_CAPMODE(chdir, "/tmp/cap_capmode_chdir"); CHECK_CAPMODE(chflags, "/tmp/cap_capmode_chflags", UF_NODUMP); CHECK_CAPMODE(chmod, "/tmp/cap_capmode_chmod", 0644); CHECK_CAPMODE(chown, "/tmp/cap_capmode_chown", -1, -1); CHECK_CAPMODE(chroot, "/tmp/cap_capmode_chroot"); CHECK_CAPMODE(connect, PF_INET, NULL, 0); CHECK_CAPMODE(creat, "/tmp/cap_capmode_creat", 0644); CHECK_CAPMODE(fchdir, fd_dir); CHECK_CAPMODE(getfsstat, &statfs, sizeof(statfs), MNT_NOWAIT); CHECK_CAPMODE(link, "/tmp/foo", "/tmp/bar"); CHECK_CAPMODE(lstat, "/tmp/cap_capmode_lstat", &sb); CHECK_CAPMODE(mknod, "/tmp/capmode_mknod", 06440, 0); CHECK_CAPMODE(mount, "procfs", "/not_mounted", 0, NULL); CHECK_CAPMODE(open, "/dev/null", O_RDWR); CHECK_CAPMODE(readlink, "/tmp/cap_capmode_readlink", NULL, 0); CHECK_CAPMODE(revoke, "/tmp/cap_capmode_revoke"); CHECK_CAPMODE(stat, "/tmp/cap_capmode_stat", &sb); CHECK_CAPMODE(symlink, "/tmp/cap_capmode_symlink_from", "/tmp/cap_capmode_symlink_to"); CHECK_CAPMODE(unlink, "/tmp/cap_capmode_unlink"); CHECK_CAPMODE(unmount, "/not_mounted", 0); /* * System calls that are permitted in capability mode. */ CHECK_SYSCALL_SUCCEEDS(close, fd_close); CHECK_SYSCALL_SUCCEEDS(dup, fd_file); CHECK_SYSCALL_SUCCEEDS(fstat, fd_file, &sb); CHECK_SYSCALL_SUCCEEDS(lseek, fd_file, 0, SEEK_SET); CHECK_SYSCALL_SUCCEEDS(msync, &fd_file, 8192, MS_ASYNC); CHECK_SYSCALL_SUCCEEDS(profil, NULL, 0, 0, 0); CHECK_SYSCALL_SUCCEEDS(read, fd_file, &ch, sizeof(ch)); CHECK_SYSCALL_SUCCEEDS(recvfrom, fd_socket, NULL, 0, 0, NULL, NULL); CHECK_SYSCALL_SUCCEEDS(setuid, getuid()); CHECK_SYSCALL_SUCCEEDS(write, fd_file, &ch, sizeof(ch)); /* * These calls will fail for lack of e.g. a proper name to send to, * but they are allowed in capability mode, so errno != ECAPMODE. */ CHECK_NOT_CAPMODE(accept, fd_socket, NULL, NULL); CHECK_NOT_CAPMODE(getpeername, fd_socket, NULL, NULL); CHECK_NOT_CAPMODE(getsockname, fd_socket, NULL, NULL); CHECK_NOT_CAPMODE(fchflags, fd_file, UF_NODUMP); CHECK_NOT_CAPMODE(recvmsg, fd_socket, NULL, 0); CHECK_NOT_CAPMODE(sendmsg, fd_socket, NULL, 0); CHECK_NOT_CAPMODE(sendto, fd_socket, NULL, 0, 0, NULL, 0); /* * System calls which should be allowed in capability mode, but which * don't return errors, and are thus difficult to check. * * We will try anyway, by checking errno. */ CHECK_SYSCALL_VOID_NOT_ECAPMODE(getegid); CHECK_SYSCALL_VOID_NOT_ECAPMODE(geteuid); CHECK_SYSCALL_VOID_NOT_ECAPMODE(getgid); CHECK_SYSCALL_VOID_NOT_ECAPMODE(getpid); CHECK_SYSCALL_VOID_NOT_ECAPMODE(getppid); CHECK_SYSCALL_VOID_NOT_ECAPMODE(getuid); /* * Finally, tests for system calls that don't fit the pattern very well. */ pid = fork(); if (pid >= 0) { if (pid == 0) { exit(0); } else if (pid > 0) { wpid = waitpid(pid, NULL, 0); if (wpid < 0) { if (errno != ECAPMODE) FAIL("capmode:waitpid"); } else FAIL("capmode:waitpid succeeded"); } } else FAIL("capmode:fork"); if (getlogin() == NULL) FAIL("test_sycalls:getlogin %d", errno); if (getsockname(fd_socket, NULL, NULL) < 0) { if (errno == ECAPMODE) FAIL("capmode:getsockname"); } /* XXXRW: ktrace */ if (pipe(fd2) == 0) { close(fd2[0]); close(fd2[1]); } else if (errno == ECAPMODE) FAIL("capmode:pipe"); /* XXXRW: ptrace. */ /* sysarch() is, by definition, architecture-dependent */ #if defined (__amd64__) || defined (__i386__) CHECK_CAPMODE(sysarch, I386_SET_IOPERM, &sysarch_arg); #else /* XXXJA: write a test for arm */ FAIL("capmode:no sysarch() test for current architecture"); #endif /* XXXRW: No error return from sync(2) to test. */ return (success); }