This reverts a portion of 274579831b
("capsicum: Limit socket
operations in capability mode") as at least rtsol and dhcpcd rely on
being able to configure network interfaces while in capability mode.
Reported by: bapt, Greg V
Sponsored by: The FreeBSD Foundation
773 lines
25 KiB
C++
773 lines
25 KiB
C++
// Test routines to make sure a variety of system calls are or are not
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// available in capability mode. The goal is not to see if they work, just
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// whether or not they return the expected ECAPMODE.
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#include <sys/types.h>
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#include <sys/socket.h>
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#ifdef __FreeBSD__
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#include <sys/sockio.h>
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#endif
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/ptrace.h>
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#include <dirent.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <time.h>
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#include <unistd.h>
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#include <pthread.h>
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#include "capsicum.h"
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#include "syscalls.h"
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#include "capsicum-test.h"
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// Test fixture that opens (and closes) a bunch of files.
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class WithFiles : public ::testing::Test {
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public:
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WithFiles() :
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fd_file_(open(TmpFile("cap_capmode"), O_RDWR|O_CREAT, 0644)),
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fd_close_(open("/dev/null", O_RDWR)),
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fd_dir_(open(tmpdir.c_str(), O_RDONLY)),
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fd_socket_(socket(PF_INET, SOCK_DGRAM, 0)),
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fd_tcp_socket_(socket(PF_INET, SOCK_STREAM, 0)) {
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EXPECT_OK(fd_file_);
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EXPECT_OK(fd_close_);
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EXPECT_OK(fd_dir_);
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EXPECT_OK(fd_socket_);
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EXPECT_OK(fd_tcp_socket_);
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}
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~WithFiles() {
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if (fd_tcp_socket_ >= 0) close(fd_tcp_socket_);
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if (fd_socket_ >= 0) close(fd_socket_);
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if (fd_dir_ >= 0) close(fd_dir_);
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if (fd_close_ >= 0) close(fd_close_);
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if (fd_file_ >= 0) close(fd_file_);
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unlink(TmpFile("cap_capmode"));
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}
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protected:
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int fd_file_;
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int fd_close_;
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int fd_dir_;
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int fd_socket_;
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int fd_tcp_socket_;
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};
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FORK_TEST_F(WithFiles, DisallowedFileSyscalls) {
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unsigned int mode = -1;
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EXPECT_OK(cap_getmode(&mode));
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EXPECT_EQ(0, (int)mode);
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EXPECT_OK(cap_enter()); // Enter capability mode.
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EXPECT_OK(cap_getmode(&mode));
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EXPECT_EQ(1, (int)mode);
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// System calls that are not permitted in capability mode.
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EXPECT_CAPMODE(access(TmpFile("cap_capmode_access"), F_OK));
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EXPECT_CAPMODE(acct(TmpFile("cap_capmode_acct")));
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EXPECT_CAPMODE(chdir(TmpFile("cap_capmode_chdir")));
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#ifdef HAVE_CHFLAGS
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EXPECT_CAPMODE(chflags(TmpFile("cap_capmode_chflags"), UF_NODUMP));
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#endif
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EXPECT_CAPMODE(chmod(TmpFile("cap_capmode_chmod"), 0644));
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EXPECT_CAPMODE(chown(TmpFile("cap_capmode_chown"), -1, -1));
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EXPECT_CAPMODE(chroot(TmpFile("cap_capmode_chroot")));
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EXPECT_CAPMODE(creat(TmpFile("cap_capmode_creat"), 0644));
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EXPECT_CAPMODE(fchdir(fd_dir_));
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#ifdef HAVE_GETFSSTAT
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struct statfs statfs;
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EXPECT_CAPMODE(getfsstat(&statfs, sizeof(statfs), MNT_NOWAIT));
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#endif
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EXPECT_CAPMODE(link(TmpFile("foo"), TmpFile("bar")));
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struct stat sb;
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EXPECT_CAPMODE(lstat(TmpFile("cap_capmode_lstat"), &sb));
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EXPECT_CAPMODE(mknod(TmpFile("capmode_mknod"), 0644 | S_IFIFO, 0));
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EXPECT_CAPMODE(bogus_mount_());
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EXPECT_CAPMODE(open("/dev/null", O_RDWR));
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char buf[64];
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EXPECT_CAPMODE(readlink(TmpFile("cap_capmode_readlink"), buf, sizeof(buf)));
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#ifdef HAVE_REVOKE
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EXPECT_CAPMODE(revoke(TmpFile("cap_capmode_revoke")));
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#endif
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EXPECT_CAPMODE(stat(TmpFile("cap_capmode_stat"), &sb));
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EXPECT_CAPMODE(symlink(TmpFile("cap_capmode_symlink_from"), TmpFile("cap_capmode_symlink_to")));
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EXPECT_CAPMODE(unlink(TmpFile("cap_capmode_unlink")));
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EXPECT_CAPMODE(umount2("/not_mounted", 0));
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}
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FORK_TEST_F(WithFiles, DisallowedSocketSyscalls) {
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EXPECT_OK(cap_enter()); // Enter capability mode.
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// System calls that are not permitted in capability mode.
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struct sockaddr_in addr;
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addr.sin_family = AF_INET;
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addr.sin_port = 0;
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addr.sin_addr.s_addr = htonl(INADDR_ANY);
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EXPECT_CAPMODE(bind_(fd_socket_, (sockaddr*)&addr, sizeof(addr)));
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addr.sin_family = AF_INET;
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addr.sin_port = 53;
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addr.sin_addr.s_addr = htonl(0x08080808);
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EXPECT_CAPMODE(connect_(fd_tcp_socket_, (sockaddr*)&addr, sizeof(addr)));
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}
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FORK_TEST_F(WithFiles, AllowedFileSyscalls) {
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int rc;
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EXPECT_OK(cap_enter()); // Enter capability mode.
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EXPECT_OK(close(fd_close_));
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fd_close_ = -1;
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int fd_dup = dup(fd_file_);
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EXPECT_OK(fd_dup);
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EXPECT_OK(dup2(fd_file_, fd_dup));
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#ifdef HAVE_DUP3
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EXPECT_OK(dup3(fd_file_, fd_dup, 0));
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#endif
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if (fd_dup >= 0) close(fd_dup);
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struct stat sb;
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EXPECT_OK(fstat(fd_file_, &sb));
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EXPECT_OK(lseek(fd_file_, 0, SEEK_SET));
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char ch;
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EXPECT_OK(read(fd_file_, &ch, sizeof(ch)));
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EXPECT_OK(write(fd_file_, &ch, sizeof(ch)));
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#ifdef HAVE_CHFLAGS
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rc = fchflags(fd_file_, UF_NODUMP);
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if (rc < 0) {
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EXPECT_NE(ECAPMODE, errno);
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}
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#endif
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char buf[1024];
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rc = getdents_(fd_dir_, (void*)buf, sizeof(buf));
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EXPECT_OK(rc);
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char data[] = "123";
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EXPECT_OK(pwrite(fd_file_, data, 1, 0));
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EXPECT_OK(pread(fd_file_, data, 1, 0));
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struct iovec io;
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io.iov_base = data;
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io.iov_len = 2;
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#if !defined(__i386__) && !defined(__linux__)
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// TODO(drysdale): reinstate these tests for 32-bit runs when possible
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// libc bug is fixed.
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EXPECT_OK(pwritev(fd_file_, &io, 1, 0));
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EXPECT_OK(preadv(fd_file_, &io, 1, 0));
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#endif
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EXPECT_OK(writev(fd_file_, &io, 1));
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EXPECT_OK(readv(fd_file_, &io, 1));
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#ifdef HAVE_SYNCFS
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EXPECT_OK(syncfs(fd_file_));
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#endif
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#ifdef HAVE_SYNC_FILE_RANGE
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EXPECT_OK(sync_file_range(fd_file_, 0, 1, 0));
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#endif
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#ifdef HAVE_READAHEAD
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if (!tmpdir_on_tmpfs) { // tmpfs doesn't support readahead(2)
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EXPECT_OK(readahead(fd_file_, 0, 1));
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}
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#endif
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}
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FORK_TEST_F(WithFiles, AllowedSocketSyscalls) {
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EXPECT_OK(cap_enter()); // Enter capability mode.
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// recvfrom() either returns -1 with EAGAIN, or 0.
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int rc = recvfrom(fd_socket_, NULL, 0, MSG_DONTWAIT, NULL, NULL);
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if (rc < 0) {
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EXPECT_EQ(EAGAIN, errno);
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}
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char ch;
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EXPECT_OK(write(fd_file_, &ch, sizeof(ch)));
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// These calls will fail for lack of e.g. a proper name to send to,
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// but they are allowed in capability mode, so errno != ECAPMODE.
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EXPECT_FAIL_NOT_CAPMODE(accept(fd_socket_, NULL, NULL));
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EXPECT_FAIL_NOT_CAPMODE(getpeername(fd_socket_, NULL, NULL));
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EXPECT_FAIL_NOT_CAPMODE(getsockname(fd_socket_, NULL, NULL));
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EXPECT_FAIL_NOT_CAPMODE(recvmsg(fd_socket_, NULL, 0));
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EXPECT_FAIL_NOT_CAPMODE(sendmsg(fd_socket_, NULL, 0));
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EXPECT_FAIL_NOT_CAPMODE(sendto(fd_socket_, NULL, 0, 0, NULL, 0));
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off_t offset = 0;
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EXPECT_FAIL_NOT_CAPMODE(sendfile_(fd_socket_, fd_file_, &offset, 1));
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// The socket/socketpair syscalls are allowed, but they don't give
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// anything externally useful (can't call bind/connect on them).
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int fd_socket2 = socket(PF_INET, SOCK_DGRAM, 0);
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EXPECT_OK(fd_socket2);
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if (fd_socket2 >= 0) close(fd_socket2);
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int fd_pair[2] = {-1, -1};
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EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, fd_pair));
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if (fd_pair[0] >= 0) close(fd_pair[0]);
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if (fd_pair[1] >= 0) close(fd_pair[1]);
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}
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FORK_TEST_F(WithFiles, AllowedSocketSyscallsIfRoot) {
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GTEST_SKIP_IF_NOT_ROOT();
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EXPECT_OK(cap_enter()); // Enter capability mode.
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// Creation of raw sockets is not permitted in capability mode.
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EXPECT_CAPMODE(socket(AF_INET, SOCK_RAW, 0));
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EXPECT_CAPMODE(socket(AF_INET, SOCK_RAW, IPPROTO_ICMP));
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EXPECT_CAPMODE(socket(AF_INET, SOCK_RAW, IPPROTO_TCP));
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EXPECT_CAPMODE(socket(AF_INET, SOCK_RAW, IPPROTO_UDP));
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EXPECT_CAPMODE(socket(AF_INET6, SOCK_RAW, IPPROTO_ICMP));
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EXPECT_CAPMODE(socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6));
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EXPECT_CAPMODE(socket(AF_INET6, SOCK_RAW, IPPROTO_TCP));
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EXPECT_CAPMODE(socket(AF_INET6, SOCK_RAW, IPPROTO_UDP));
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EXPECT_CAPMODE(socket(AF_ROUTE, SOCK_RAW, 0));
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// Interface configuration ioctls are not permitted in capability
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// mode.
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//
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// This test is disabled for now as the corresponding kernel change was
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// disabled.
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#if 0
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#ifdef __FreeBSD__
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struct if_clonereq req;
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req.ifcr_total = 0;
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req.ifcr_count = 1;
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req.ifcr_buffer = static_cast<char *>(malloc(IFNAMSIZ));
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EXPECT_CAPMODE(ioctl(fd_socket_, SIOCIFGCLONERS, &req));
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free(req.ifcr_buffer);
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#endif
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#endif
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}
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#ifdef HAVE_SEND_RECV_MMSG
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FORK_TEST(Capmode, AllowedMmsgSendRecv) {
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int fd_socket = socket(PF_INET, SOCK_DGRAM, 0);
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struct sockaddr_in addr;
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addr.sin_family = AF_INET;
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addr.sin_port = htons(0);
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addr.sin_addr.s_addr = htonl(INADDR_ANY);
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EXPECT_OK(bind(fd_socket, (sockaddr*)&addr, sizeof(addr)));
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EXPECT_OK(cap_enter()); // Enter capability mode.
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char buffer[256] = {0};
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struct iovec iov;
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iov.iov_base = buffer;
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iov.iov_len = sizeof(buffer);
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struct mmsghdr mm;
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memset(&mm, 0, sizeof(mm));
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mm.msg_hdr.msg_iov = &iov;
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mm.msg_hdr.msg_iovlen = 1;
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struct timespec ts;
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ts.tv_sec = 1;
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ts.tv_nsec = 100;
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EXPECT_FAIL_NOT_CAPMODE(recvmmsg(fd_socket, &mm, 1, MSG_DONTWAIT, &ts));
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EXPECT_FAIL_NOT_CAPMODE(sendmmsg(fd_socket, &mm, 1, 0));
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close(fd_socket);
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}
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#endif
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FORK_TEST(Capmode, AllowedIdentifierSyscalls) {
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// Record some identifiers
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gid_t my_gid = getgid();
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pid_t my_pid = getpid();
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pid_t my_ppid = getppid();
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uid_t my_uid = getuid();
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pid_t my_sid = getsid(my_pid);
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EXPECT_OK(cap_enter()); // Enter capability mode.
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EXPECT_EQ(my_gid, getegid_());
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EXPECT_EQ(my_uid, geteuid_());
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EXPECT_EQ(my_gid, getgid_());
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EXPECT_EQ(my_pid, getpid());
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EXPECT_EQ(my_ppid, getppid());
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EXPECT_EQ(my_uid, getuid_());
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EXPECT_EQ(my_sid, getsid(my_pid));
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gid_t grps[128];
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EXPECT_OK(getgroups_(128, grps));
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uid_t ruid;
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uid_t euid;
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uid_t suid;
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EXPECT_OK(getresuid(&ruid, &euid, &suid));
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gid_t rgid;
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gid_t egid;
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gid_t sgid;
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EXPECT_OK(getresgid(&rgid, &egid, &sgid));
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#ifdef HAVE_GETLOGIN
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EXPECT_TRUE(getlogin() != NULL);
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#endif
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// Set various identifiers (to their existing values).
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EXPECT_OK(setgid(my_gid));
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#ifdef HAVE_SETFSGID
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EXPECT_OK(setfsgid(my_gid));
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#endif
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EXPECT_OK(setuid(my_uid));
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#ifdef HAVE_SETFSUID
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EXPECT_OK(setfsuid(my_uid));
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#endif
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EXPECT_OK(setregid(my_gid, my_gid));
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EXPECT_OK(setresgid(my_gid, my_gid, my_gid));
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EXPECT_OK(setreuid(my_uid, my_uid));
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EXPECT_OK(setresuid(my_uid, my_uid, my_uid));
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EXPECT_OK(setsid());
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}
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FORK_TEST(Capmode, AllowedSchedSyscalls) {
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EXPECT_OK(cap_enter()); // Enter capability mode.
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int policy = sched_getscheduler(0);
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EXPECT_OK(policy);
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struct sched_param sp;
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EXPECT_OK(sched_getparam(0, &sp));
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if (policy >= 0 && (!SCHED_SETSCHEDULER_REQUIRES_ROOT || getuid() == 0)) {
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EXPECT_OK(sched_setscheduler(0, policy, &sp));
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}
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EXPECT_OK(sched_setparam(0, &sp));
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EXPECT_OK(sched_get_priority_max(policy));
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EXPECT_OK(sched_get_priority_min(policy));
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struct timespec ts;
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EXPECT_OK(sched_rr_get_interval(0, &ts));
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EXPECT_OK(sched_yield());
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}
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FORK_TEST(Capmode, AllowedTimerSyscalls) {
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EXPECT_OK(cap_enter()); // Enter capability mode.
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struct timespec ts;
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EXPECT_OK(clock_getres(CLOCK_REALTIME, &ts));
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EXPECT_OK(clock_gettime(CLOCK_REALTIME, &ts));
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struct itimerval itv;
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EXPECT_OK(getitimer(ITIMER_REAL, &itv));
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EXPECT_OK(setitimer(ITIMER_REAL, &itv, NULL));
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struct timeval tv;
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struct timezone tz;
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EXPECT_OK(gettimeofday(&tv, &tz));
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ts.tv_sec = 0;
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ts.tv_nsec = 1;
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EXPECT_OK(nanosleep(&ts, NULL));
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}
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FORK_TEST(Capmode, AllowedProfilSyscall) {
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EXPECT_OK(cap_enter()); // Enter capability mode.
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char sbuf[32];
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EXPECT_OK(profil((profil_arg1_t*)sbuf, sizeof(sbuf), 0, 1));
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}
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FORK_TEST(Capmode, AllowedResourceSyscalls) {
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EXPECT_OK(cap_enter()); // Enter capability mode.
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errno = 0;
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int rc = getpriority(PRIO_PROCESS, 0);
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EXPECT_EQ(0, errno);
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EXPECT_OK(setpriority(PRIO_PROCESS, 0, rc));
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struct rlimit rlim;
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EXPECT_OK(getrlimit_(RLIMIT_CORE, &rlim));
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EXPECT_OK(setrlimit(RLIMIT_CORE, &rlim));
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struct rusage ruse;
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EXPECT_OK(getrusage(RUSAGE_SELF, &ruse));
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}
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FORK_TEST(CapMode, AllowedMmapSyscalls) {
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// mmap() some memory.
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size_t mem_size = getpagesize();
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void *mem = mmap(NULL, mem_size, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
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EXPECT_TRUE(mem != NULL);
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EXPECT_OK(cap_enter()); // Enter capability mode.
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EXPECT_OK(msync(mem, mem_size, MS_ASYNC));
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EXPECT_OK(madvise(mem, mem_size, MADV_NORMAL));
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unsigned char vec[2];
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EXPECT_OK(mincore_(mem, mem_size, vec));
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EXPECT_OK(mprotect(mem, mem_size, PROT_READ|PROT_WRITE));
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if (!MLOCK_REQUIRES_ROOT || getuid() == 0) {
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EXPECT_OK(mlock(mem, mem_size));
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EXPECT_OK(munlock(mem, mem_size));
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int rc = mlockall(MCL_CURRENT);
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if (rc != 0) {
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// mlockall may well fail with ENOMEM for non-root users, as the
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// default RLIMIT_MEMLOCK value isn't that big.
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EXPECT_NE(ECAPMODE, errno);
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}
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EXPECT_OK(munlockall());
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}
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// Unmap the memory.
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EXPECT_OK(munmap(mem, mem_size));
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}
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FORK_TEST(Capmode, AllowedPipeSyscalls) {
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EXPECT_OK(cap_enter()); // Enter capability mode
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int fd2[2];
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int rc = pipe(fd2);
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EXPECT_EQ(0, rc);
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#ifdef HAVE_VMSPLICE
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char buf[11] = "0123456789";
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struct iovec iov;
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iov.iov_base = buf;
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iov.iov_len = sizeof(buf);
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EXPECT_FAIL_NOT_CAPMODE(vmsplice(fd2[0], &iov, 1, SPLICE_F_NONBLOCK));
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#endif
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if (rc == 0) {
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close(fd2[0]);
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close(fd2[1]);
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};
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#ifdef HAVE_PIPE2
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rc = pipe2(fd2, 0);
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EXPECT_EQ(0, rc);
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if (rc == 0) {
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close(fd2[0]);
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close(fd2[1]);
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};
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#endif
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}
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TEST(Capmode, AllowedAtSyscalls) {
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int rc = mkdir(TmpFile("cap_at_syscalls"), 0755);
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EXPECT_OK(rc);
|
|
if (rc < 0 && errno != EEXIST) return;
|
|
int dfd = open(TmpFile("cap_at_syscalls"), O_RDONLY);
|
|
EXPECT_OK(dfd);
|
|
|
|
int file = openat(dfd, "testfile", O_RDONLY|O_CREAT, 0644);
|
|
EXPECT_OK(file);
|
|
EXPECT_OK(close(file));
|
|
|
|
|
|
pid_t child = fork();
|
|
if (child == 0) {
|
|
// Child: enter cap mode and run tests
|
|
EXPECT_OK(cap_enter()); // Enter capability mode
|
|
|
|
struct stat fs;
|
|
EXPECT_OK(fstatat(dfd, "testfile", &fs, 0));
|
|
EXPECT_OK(mkdirat(dfd, "subdir", 0600));
|
|
EXPECT_OK(fchmodat(dfd, "subdir", 0644, 0));
|
|
EXPECT_OK(faccessat(dfd, "subdir", F_OK, 0));
|
|
EXPECT_OK(renameat(dfd, "subdir", dfd, "subdir2"));
|
|
EXPECT_OK(renameat(dfd, "subdir2", dfd, "subdir"));
|
|
struct timeval tv[2];
|
|
struct timezone tz;
|
|
EXPECT_OK(gettimeofday(&tv[0], &tz));
|
|
EXPECT_OK(gettimeofday(&tv[1], &tz));
|
|
EXPECT_OK(futimesat(dfd, "testfile", tv));
|
|
|
|
EXPECT_OK(fchownat(dfd, "testfile", fs.st_uid, fs.st_gid, 0));
|
|
EXPECT_OK(linkat(dfd, "testfile", dfd, "linky", 0));
|
|
EXPECT_OK(symlinkat("testfile", dfd, "symlink"));
|
|
char buffer[256];
|
|
EXPECT_OK(readlinkat(dfd, "symlink", buffer, sizeof(buffer)));
|
|
EXPECT_OK(unlinkat(dfd, "linky", 0));
|
|
EXPECT_OK(unlinkat(dfd, "subdir", AT_REMOVEDIR));
|
|
|
|
// Check that invalid requests get a non-Capsicum errno.
|
|
errno = 0;
|
|
rc = readlinkat(-1, "symlink", buffer, sizeof(buffer));
|
|
EXPECT_GE(0, rc);
|
|
EXPECT_NE(ECAPMODE, errno);
|
|
|
|
exit(HasFailure());
|
|
}
|
|
|
|
// Wait for the child.
|
|
int status;
|
|
EXPECT_EQ(child, waitpid(child, &status, 0));
|
|
rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
|
|
EXPECT_EQ(0, rc);
|
|
|
|
// Tidy up.
|
|
close(dfd);
|
|
rmdir(TmpFile("cap_at_syscalls/subdir"));
|
|
unlink(TmpFile("cap_at_syscalls/symlink"));
|
|
unlink(TmpFile("cap_at_syscalls/linky"));
|
|
unlink(TmpFile("cap_at_syscalls/testfile"));
|
|
rmdir(TmpFile("cap_at_syscalls"));
|
|
}
|
|
|
|
TEST(Capmode, AllowedAtSyscallsCwd) {
|
|
int rc = mkdir(TmpFile("cap_at_syscalls_cwd"), 0755);
|
|
EXPECT_OK(rc);
|
|
if (rc < 0 && errno != EEXIST) return;
|
|
int dfd = open(TmpFile("cap_at_syscalls_cwd"), O_RDONLY);
|
|
EXPECT_OK(dfd);
|
|
|
|
int file = openat(dfd, "testfile", O_RDONLY|O_CREAT, 0644);
|
|
EXPECT_OK(file);
|
|
EXPECT_OK(close(file));
|
|
|
|
pid_t child = fork();
|
|
if (child == 0) {
|
|
// Child: move into temp dir, enter cap mode and run tests
|
|
EXPECT_OK(fchdir(dfd));
|
|
EXPECT_OK(cap_enter()); // Enter capability mode
|
|
|
|
// Test that *at(AT_FDCWD, path,...) is policed with ECAPMODE.
|
|
EXPECT_CAPMODE(openat(AT_FDCWD, "testfile", O_RDONLY));
|
|
struct stat fs;
|
|
EXPECT_CAPMODE(fstatat(AT_FDCWD, "testfile", &fs, 0));
|
|
EXPECT_CAPMODE(mkdirat(AT_FDCWD, "subdir", 0600));
|
|
EXPECT_CAPMODE(fchmodat(AT_FDCWD, "subdir", 0644, 0));
|
|
EXPECT_CAPMODE(faccessat(AT_FDCWD, "subdir", F_OK, 0));
|
|
EXPECT_CAPMODE(renameat(AT_FDCWD, "subdir", AT_FDCWD, "subdir2"));
|
|
EXPECT_CAPMODE(renameat(AT_FDCWD, "subdir2", AT_FDCWD, "subdir"));
|
|
struct timeval tv[2];
|
|
struct timezone tz;
|
|
EXPECT_OK(gettimeofday(&tv[0], &tz));
|
|
EXPECT_OK(gettimeofday(&tv[1], &tz));
|
|
EXPECT_CAPMODE(futimesat(AT_FDCWD, "testfile", tv));
|
|
|
|
EXPECT_CAPMODE(fchownat(AT_FDCWD, "testfile", fs.st_uid, fs.st_gid, 0));
|
|
EXPECT_CAPMODE(linkat(AT_FDCWD, "testfile", AT_FDCWD, "linky", 0));
|
|
EXPECT_CAPMODE(symlinkat("testfile", AT_FDCWD, "symlink"));
|
|
char buffer[256];
|
|
EXPECT_CAPMODE(readlinkat(AT_FDCWD, "symlink", buffer, sizeof(buffer)));
|
|
EXPECT_CAPMODE(unlinkat(AT_FDCWD, "linky", 0));
|
|
|
|
exit(HasFailure());
|
|
}
|
|
|
|
// Wait for the child.
|
|
int status;
|
|
EXPECT_EQ(child, waitpid(child, &status, 0));
|
|
rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
|
|
EXPECT_EQ(0, rc);
|
|
|
|
// Tidy up.
|
|
close(dfd);
|
|
rmdir(TmpFile("cap_at_syscalls_cwd/subdir"));
|
|
unlink(TmpFile("cap_at_syscalls_cwd/symlink"));
|
|
unlink(TmpFile("cap_at_syscalls_cwd/linky"));
|
|
unlink(TmpFile("cap_at_syscalls_cwd/testfile"));
|
|
rmdir(TmpFile("cap_at_syscalls_cwd"));
|
|
}
|
|
|
|
TEST(Capmode, Abort) {
|
|
// Check that abort(3) works even in capability mode.
|
|
pid_t child = fork();
|
|
if (child == 0) {
|
|
// Child: enter capability mode and call abort(3).
|
|
// Triggers something like kill(getpid(), SIGABRT).
|
|
cap_enter(); // Enter capability mode.
|
|
abort();
|
|
exit(99);
|
|
}
|
|
int status;
|
|
EXPECT_EQ(child, waitpid(child, &status, 0));
|
|
EXPECT_TRUE(WIFSIGNALED(status)) << " status = " << std::hex << status;
|
|
EXPECT_EQ(SIGABRT, WTERMSIG(status)) << " status = " << std::hex << status;
|
|
}
|
|
|
|
FORK_TEST_F(WithFiles, AllowedMiscSyscalls) {
|
|
umask(022);
|
|
mode_t um_before = umask(022);
|
|
int pipefds[2];
|
|
EXPECT_OK(pipe(pipefds));
|
|
EXPECT_OK(cap_enter()); // Enter capability mode.
|
|
|
|
mode_t um = umask(022);
|
|
EXPECT_NE(-ECAPMODE, (int)um);
|
|
EXPECT_EQ(um_before, um);
|
|
stack_t ss;
|
|
EXPECT_OK(sigaltstack(NULL, &ss));
|
|
|
|
// Finally, tests for system calls that don't fit the pattern very well.
|
|
pid_t pid = fork();
|
|
EXPECT_OK(pid);
|
|
if (pid == 0) {
|
|
// Child: wait for an exit message from parent (so we can test waitpid).
|
|
EXPECT_OK(close(pipefds[0]));
|
|
SEND_INT_MESSAGE(pipefds[1], MSG_CHILD_STARTED);
|
|
AWAIT_INT_MESSAGE(pipefds[1], MSG_PARENT_REQUEST_CHILD_EXIT);
|
|
exit(0);
|
|
} else if (pid > 0) {
|
|
EXPECT_OK(close(pipefds[1]));
|
|
AWAIT_INT_MESSAGE(pipefds[0], MSG_CHILD_STARTED);
|
|
errno = 0;
|
|
EXPECT_CAPMODE(ptrace_(PTRACE_PEEKDATA_, pid, &pid, NULL));
|
|
EXPECT_CAPMODE(waitpid(pid, NULL, WNOHANG));
|
|
SEND_INT_MESSAGE(pipefds[0], MSG_PARENT_REQUEST_CHILD_EXIT);
|
|
if (verbose) fprintf(stderr, " child finished\n");
|
|
}
|
|
|
|
// No error return from sync(2) to test, but check errno remains unset.
|
|
errno = 0;
|
|
sync();
|
|
EXPECT_EQ(0, errno);
|
|
|
|
// TODO(FreeBSD): ktrace
|
|
|
|
#ifdef HAVE_SYSARCH
|
|
// sysarch() is, by definition, architecture-dependent
|
|
#if defined (__amd64__) || defined (__i386__)
|
|
long sysarch_arg = 0;
|
|
EXPECT_CAPMODE(sysarch(I386_SET_IOPERM, &sysarch_arg));
|
|
#else
|
|
// TOOD(jra): write a test for other architectures, like arm
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
void *thread_fn(void *p) {
|
|
int fd = (int)(intptr_t)p;
|
|
if (verbose) fprintf(stderr, " thread waiting to run\n");
|
|
AWAIT_INT_MESSAGE(fd, MSG_PARENT_CHILD_SHOULD_RUN);
|
|
EXPECT_OK(getpid_());
|
|
EXPECT_CAPMODE(open("/dev/null", O_RDWR));
|
|
// Return whether there have been any failures to the main thread.
|
|
void *rval = (void *)(intptr_t)testing::Test::HasFailure();
|
|
if (verbose) fprintf(stderr, " thread finished: %p\n", rval);
|
|
return rval;
|
|
}
|
|
|
|
// Check that restrictions are the same in subprocesses and threads
|
|
FORK_TEST(Capmode, NewThread) {
|
|
// Fire off a new thread before entering capability mode
|
|
pthread_t early_thread;
|
|
void *thread_rval;
|
|
// Create two pipes, one for synchronization with the threads, the other to
|
|
// synchronize with the children (since we can't use waitpid after cap_enter).
|
|
// Note: Could use pdfork+pdwait instead, but that is tested in procdesc.cc.
|
|
int thread_pipe[2];
|
|
EXPECT_OK(pipe(thread_pipe));
|
|
int proc_pipe[2];
|
|
EXPECT_OK(pipe(proc_pipe));
|
|
EXPECT_OK(pthread_create(&early_thread, NULL, thread_fn,
|
|
(void *)(intptr_t)thread_pipe[1]));
|
|
|
|
// Fire off a new process before entering capability mode.
|
|
if (verbose) fprintf(stderr, " starting second child (non-capability mode)\n");
|
|
int early_child = fork();
|
|
EXPECT_OK(early_child);
|
|
if (early_child == 0) {
|
|
if (verbose) fprintf(stderr, " first child started\n");
|
|
EXPECT_OK(close(proc_pipe[0]));
|
|
// Child: wait and then confirm this process is unaffected by capability mode in the parent.
|
|
AWAIT_INT_MESSAGE(proc_pipe[1], MSG_PARENT_CHILD_SHOULD_RUN);
|
|
int fd = open("/dev/null", O_RDWR);
|
|
EXPECT_OK(fd);
|
|
close(fd);
|
|
// Notify the parent of success/failure.
|
|
int rval = (int)testing::Test::HasFailure();
|
|
SEND_INT_MESSAGE(proc_pipe[1], rval);
|
|
if (verbose) fprintf(stderr, " first child finished: %d\n", rval);
|
|
exit(rval);
|
|
}
|
|
|
|
EXPECT_OK(cap_enter()); // Enter capability mode.
|
|
// At this point the current process has both a child process and a
|
|
// child thread that were created before entering capability mode.
|
|
// - The child process is unaffected by capability mode.
|
|
// - The child thread is affected by capability mode.
|
|
SEND_INT_MESSAGE(proc_pipe[0], MSG_PARENT_CHILD_SHOULD_RUN);
|
|
|
|
// Do an allowed syscall.
|
|
EXPECT_OK(getpid_());
|
|
// Wait for the first child to exit (should get a zero exit code message).
|
|
AWAIT_INT_MESSAGE(proc_pipe[0], 0);
|
|
|
|
// The child processes/threads return HasFailure(), so we depend on no prior errors.
|
|
ASSERT_FALSE(testing::Test::HasFailure())
|
|
<< "Cannot continue test with pre-existing failures.";
|
|
// Now that we're in capability mode, if we create a second child process
|
|
// it will be affected by capability mode.
|
|
if (verbose) fprintf(stderr, " starting second child (in capability mode)\n");
|
|
int child = fork();
|
|
EXPECT_OK(child);
|
|
if (child == 0) {
|
|
if (verbose) fprintf(stderr, " second child started\n");
|
|
EXPECT_OK(close(proc_pipe[0]));
|
|
// Child: do an allowed and a disallowed syscall.
|
|
EXPECT_OK(getpid_());
|
|
EXPECT_CAPMODE(open("/dev/null", O_RDWR));
|
|
// Notify the parent of success/failure.
|
|
int rval = (int)testing::Test::HasFailure();
|
|
SEND_INT_MESSAGE(proc_pipe[1], rval);
|
|
if (verbose) fprintf(stderr, " second child finished: %d\n", rval);
|
|
exit(rval);
|
|
}
|
|
// Now tell the early_started thread that it can run. We expect it to also
|
|
// be affected by capability mode since it's per-process not per-thread.
|
|
// Note: it is important that we don't allow the thread to run before fork(),
|
|
// since that could result in fork() being called while the thread holds one
|
|
// of the gtest-internal mutexes, so the child process deadlocks.
|
|
SEND_INT_MESSAGE(thread_pipe[0], MSG_PARENT_CHILD_SHOULD_RUN);
|
|
// Wait for the early-started thread.
|
|
EXPECT_OK(pthread_join(early_thread, &thread_rval));
|
|
EXPECT_FALSE((bool)(intptr_t)thread_rval) << "thread returned failure";
|
|
|
|
// Wait for the second child to exit (should get a zero exit code message).
|
|
AWAIT_INT_MESSAGE(proc_pipe[0], 0);
|
|
|
|
// Fire off a new (second) child thread, which is also affected by capability mode.
|
|
ASSERT_FALSE(testing::Test::HasFailure())
|
|
<< "Cannot continue test with pre-existing failures.";
|
|
pthread_t child_thread;
|
|
EXPECT_OK(pthread_create(&child_thread, NULL, thread_fn,
|
|
(void *)(intptr_t)thread_pipe[1]));
|
|
SEND_INT_MESSAGE(thread_pipe[0], MSG_PARENT_CHILD_SHOULD_RUN);
|
|
EXPECT_OK(pthread_join(child_thread, &thread_rval));
|
|
EXPECT_FALSE((bool)(intptr_t)thread_rval) << "thread returned failure";
|
|
|
|
// Fork a subprocess which fires off a new thread.
|
|
ASSERT_FALSE(testing::Test::HasFailure())
|
|
<< "Cannot continue test with pre-existing failures.";
|
|
if (verbose) fprintf(stderr, " starting third child (in capability mode)\n");
|
|
child = fork();
|
|
EXPECT_OK(child);
|
|
if (child == 0) {
|
|
if (verbose) fprintf(stderr, " third child started\n");
|
|
EXPECT_OK(close(proc_pipe[0]));
|
|
pthread_t child_thread2;
|
|
EXPECT_OK(pthread_create(&child_thread2, NULL, thread_fn,
|
|
(void *)(intptr_t)thread_pipe[1]));
|
|
SEND_INT_MESSAGE(thread_pipe[0], MSG_PARENT_CHILD_SHOULD_RUN);
|
|
EXPECT_OK(pthread_join(child_thread2, &thread_rval));
|
|
EXPECT_FALSE((bool)(intptr_t)thread_rval) << "thread returned failure";
|
|
// Notify the parent of success/failure.
|
|
int rval = (int)testing::Test::HasFailure();
|
|
SEND_INT_MESSAGE(proc_pipe[1], rval);
|
|
if (verbose) fprintf(stderr, " third child finished: %d\n", rval);
|
|
exit(rval);
|
|
}
|
|
// Wait for the third child to exit (should get a zero exit code message).
|
|
AWAIT_INT_MESSAGE(proc_pipe[0], 0);
|
|
close(proc_pipe[0]);
|
|
close(proc_pipe[1]);
|
|
close(thread_pipe[0]);
|
|
close(thread_pipe[1]);
|
|
}
|
|
|
|
static volatile sig_atomic_t had_signal = 0;
|
|
static void handle_signal(int) { had_signal = 1; }
|
|
|
|
FORK_TEST(Capmode, SelfKill) {
|
|
pid_t me = getpid();
|
|
sighandler_t original = signal(SIGUSR1, handle_signal);
|
|
|
|
pid_t child = fork();
|
|
if (child == 0) {
|
|
// Child: sleep and exit
|
|
sleep(1);
|
|
exit(0);
|
|
}
|
|
|
|
EXPECT_OK(cap_enter()); // Enter capability mode.
|
|
|
|
// Can only kill(2) to own pid.
|
|
EXPECT_CAPMODE(kill(child, SIGUSR1));
|
|
EXPECT_OK(kill(me, SIGUSR1));
|
|
EXPECT_EQ(1, had_signal);
|
|
|
|
signal(SIGUSR1, original);
|
|
}
|