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capability-fd.cc
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capability-fd.cc
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#include <stdio.h>
#include <unistd.h>
#include <sys/file.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdint.h>
#include "capsicum.h"
#include "syscalls.h"
#include "capsicum-test.h"
/* Utilities for printing rights information */
/* Written in C style to allow for: */
/* TODO(drysdale): migrate these to somewhere in libcaprights/ */
#define RIGHTS_INFO(RR) { (RR), #RR}
typedef struct {
uint64_t right;
const char* name;
} right_info;
static right_info known_rights[] = {
/* Rights that are common to all versions of Capsicum */
RIGHTS_INFO(CAP_READ),
RIGHTS_INFO(CAP_WRITE),
RIGHTS_INFO(CAP_SEEK_TELL),
RIGHTS_INFO(CAP_SEEK),
RIGHTS_INFO(CAP_PREAD),
RIGHTS_INFO(CAP_PWRITE),
RIGHTS_INFO(CAP_MMAP),
RIGHTS_INFO(CAP_MMAP_R),
RIGHTS_INFO(CAP_MMAP_W),
RIGHTS_INFO(CAP_MMAP_X),
RIGHTS_INFO(CAP_MMAP_RW),
RIGHTS_INFO(CAP_MMAP_RX),
RIGHTS_INFO(CAP_MMAP_WX),
RIGHTS_INFO(CAP_MMAP_RWX),
RIGHTS_INFO(CAP_CREATE),
RIGHTS_INFO(CAP_FEXECVE),
RIGHTS_INFO(CAP_FSYNC),
RIGHTS_INFO(CAP_FTRUNCATE),
RIGHTS_INFO(CAP_LOOKUP),
RIGHTS_INFO(CAP_FCHDIR),
RIGHTS_INFO(CAP_FCHFLAGS),
RIGHTS_INFO(CAP_CHFLAGSAT),
RIGHTS_INFO(CAP_FCHMOD),
RIGHTS_INFO(CAP_FCHMODAT),
RIGHTS_INFO(CAP_FCHOWN),
RIGHTS_INFO(CAP_FCHOWNAT),
RIGHTS_INFO(CAP_FCNTL),
RIGHTS_INFO(CAP_FLOCK),
RIGHTS_INFO(CAP_FPATHCONF),
RIGHTS_INFO(CAP_FSCK),
RIGHTS_INFO(CAP_FSTAT),
RIGHTS_INFO(CAP_FSTATAT),
RIGHTS_INFO(CAP_FSTATFS),
RIGHTS_INFO(CAP_FUTIMES),
RIGHTS_INFO(CAP_FUTIMESAT),
RIGHTS_INFO(CAP_MKDIRAT),
RIGHTS_INFO(CAP_MKFIFOAT),
RIGHTS_INFO(CAP_MKNODAT),
RIGHTS_INFO(CAP_RENAMEAT_SOURCE),
RIGHTS_INFO(CAP_SYMLINKAT),
RIGHTS_INFO(CAP_UNLINKAT),
RIGHTS_INFO(CAP_ACCEPT),
RIGHTS_INFO(CAP_BIND),
RIGHTS_INFO(CAP_CONNECT),
RIGHTS_INFO(CAP_GETPEERNAME),
RIGHTS_INFO(CAP_GETSOCKNAME),
RIGHTS_INFO(CAP_GETSOCKOPT),
RIGHTS_INFO(CAP_LISTEN),
RIGHTS_INFO(CAP_PEELOFF),
RIGHTS_INFO(CAP_RECV),
RIGHTS_INFO(CAP_SEND),
RIGHTS_INFO(CAP_SETSOCKOPT),
RIGHTS_INFO(CAP_SHUTDOWN),
RIGHTS_INFO(CAP_BINDAT),
RIGHTS_INFO(CAP_CONNECTAT),
RIGHTS_INFO(CAP_LINKAT_SOURCE),
RIGHTS_INFO(CAP_RENAMEAT_TARGET),
RIGHTS_INFO(CAP_SOCK_CLIENT),
RIGHTS_INFO(CAP_SOCK_SERVER),
RIGHTS_INFO(CAP_MAC_GET),
RIGHTS_INFO(CAP_MAC_SET),
RIGHTS_INFO(CAP_SEM_GETVALUE),
RIGHTS_INFO(CAP_SEM_POST),
RIGHTS_INFO(CAP_SEM_WAIT),
RIGHTS_INFO(CAP_EVENT),
RIGHTS_INFO(CAP_KQUEUE_EVENT),
RIGHTS_INFO(CAP_IOCTL),
RIGHTS_INFO(CAP_TTYHOOK),
RIGHTS_INFO(CAP_PDWAIT),
RIGHTS_INFO(CAP_PDGETPID),
RIGHTS_INFO(CAP_PDKILL),
RIGHTS_INFO(CAP_EXTATTR_DELETE),
RIGHTS_INFO(CAP_EXTATTR_GET),
RIGHTS_INFO(CAP_EXTATTR_LIST),
RIGHTS_INFO(CAP_EXTATTR_SET),
RIGHTS_INFO(CAP_ACL_CHECK),
RIGHTS_INFO(CAP_ACL_DELETE),
RIGHTS_INFO(CAP_ACL_GET),
RIGHTS_INFO(CAP_ACL_SET),
RIGHTS_INFO(CAP_KQUEUE_CHANGE),
RIGHTS_INFO(CAP_KQUEUE),
/* Rights that are only present in some version or some OS, and so are #ifdef'ed */
/* LINKAT got split */
#ifdef CAP_LINKAT
RIGHTS_INFO(CAP_LINKAT),
#endif
#ifdef CAP_LINKAT_SOURCE
RIGHTS_INFO(CAP_LINKAT_SOURCE),
#endif
#ifdef CAP_LINKAT_TARGET
RIGHTS_INFO(CAP_LINKAT_TARGET),
#endif
/* Linux aliased some FD operations for pdgetpid/pdkill */
#ifdef CAP_PDGETPID_FREEBSD
RIGHTS_INFO(CAP_PDGETPID_FREEBSD),
#endif
#ifdef CAP_PDKILL_FREEBSD
RIGHTS_INFO(CAP_PDKILL_FREEBSD),
#endif
/* Linux-specific rights */
#ifdef CAP_FSIGNAL
RIGHTS_INFO(CAP_FSIGNAL),
#endif
#ifdef CAP_EPOLL_CTL
RIGHTS_INFO(CAP_EPOLL_CTL),
#endif
#ifdef CAP_NOTIFY
RIGHTS_INFO(CAP_NOTIFY),
#endif
#ifdef CAP_SETNS
RIGHTS_INFO(CAP_SETNS),
#endif
#ifdef CAP_PERFMON
RIGHTS_INFO(CAP_PERFMON),
#endif
#ifdef CAP_BPF
RIGHTS_INFO(CAP_BPF),
#endif
/* Rights in later versions of FreeBSD (>10.0) */
};
void ShowCapRights(FILE *out, int fd) {
size_t ii;
bool first = true;
cap_rights_t rights;
CAP_SET_NONE(&rights);
if (cap_rights_get(fd, &rights) < 0) {
fprintf(out, "Failed to get rights for fd %d: errno %d\n", fd, errno);
return;
}
/* First print out all known rights */
size_t num_known = (sizeof(known_rights)/sizeof(known_rights[0]));
for (ii = 0; ii < num_known; ii++) {
if (cap_rights_is_set(&rights, known_rights[ii].right)) {
if (!first) fprintf(out, ",");
first = false;
fprintf(out, "%s", known_rights[ii].name);
}
}
/* Now repeat the loop, clearing rights we know of; this needs to be
* a separate loop because some named rights overlap.
*/
for (ii = 0; ii < num_known; ii++) {
cap_rights_clear(&rights, known_rights[ii].right);
}
/* The following relies on the internal structure of cap_rights_t to
* try to show rights we don't know about. */
for (ii = 0; ii < (size_t)CAPARSIZE(&rights); ii++) {
uint64_t bits = (rights.cr_rights[0] & 0x01ffffffffffffffULL);
if (bits != 0) {
uint64_t which = 1;
for (which = 1; which < 0x0200000000000000 ; which <<= 1) {
if (bits & which) {
if (!first) fprintf(out, ",");
fprintf(out, "CAP_RIGHT(%d, 0x%016llxULL)", (int)ii, (long long unsigned)which);
}
}
}
}
fprintf(out, "\n");
}
void ShowAllCapRights(FILE *out) {
int fd;
struct rlimit limits;
if (getrlimit(RLIMIT_NOFILE, &limits) != 0) {
fprintf(out, "Failed to getrlimit for max FDs: errno %d\n", errno);
return;
}
for (fd = 0; fd < (int)limits.rlim_cur; fd++) {
if (fcntl(fd, F_GETFD, 0) != 0) {
continue;
}
fprintf(out, "fd %d: ", fd);
ShowCapRights(out, fd);
}
}
FORK_TEST(Capability, CapNew) {
cap_rights_t r_rws;
cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
cap_rights_t r_all;
CAP_SET_ALL(&r_all);
int cap_fd = dup(STDOUT_FILENO);
cap_rights_t rights;
CAP_SET_NONE(&rights);
EXPECT_OK(cap_rights_get(cap_fd, &rights));
EXPECT_RIGHTS_EQ(&r_all, &rights);
EXPECT_OK(cap_fd);
EXPECT_OK(cap_rights_limit(cap_fd, &r_rws));
if (cap_fd < 0) return;
int rc = write(cap_fd, "OK!\n", 4);
EXPECT_OK(rc);
EXPECT_EQ(4, rc);
EXPECT_OK(cap_rights_get(cap_fd, &rights));
EXPECT_RIGHTS_EQ(&r_rws, &rights);
// dup/dup2 should preserve rights.
int cap_dup = dup(cap_fd);
EXPECT_OK(cap_dup);
EXPECT_OK(cap_rights_get(cap_dup, &rights));
EXPECT_RIGHTS_EQ(&r_rws, &rights);
close(cap_dup);
EXPECT_OK(dup2(cap_fd, cap_dup));
EXPECT_OK(cap_rights_get(cap_dup, &rights));
EXPECT_RIGHTS_EQ(&r_rws, &rights);
close(cap_dup);
#ifdef HAVE_DUP3
EXPECT_OK(dup3(cap_fd, cap_dup, 0));
EXPECT_OK(cap_rights_get(cap_dup, &rights));
EXPECT_RIGHTS_EQ(&r_rws, &rights);
close(cap_dup);
#endif
// Try to get a disjoint set of rights in a sub-capability.
cap_rights_t r_rs;
cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
cap_rights_t r_rsmapchmod;
cap_rights_init(&r_rsmapchmod, CAP_READ, CAP_SEEK, CAP_MMAP, CAP_FCHMOD);
int cap_cap_fd = dup(cap_fd);
EXPECT_OK(cap_cap_fd);
EXPECT_NOTCAPABLE(cap_rights_limit(cap_cap_fd, &r_rsmapchmod));
// Dump rights info to stderr (mostly to ensure that Show[All]CapRights()
// is working.
ShowAllCapRights(stderr);
EXPECT_OK(close(cap_fd));
}
FORK_TEST(Capability, CapEnter) {
EXPECT_EQ(0, cap_enter());
}
FORK_TEST(Capability, BasicInterception) {
cap_rights_t r_0;
cap_rights_init(&r_0, 0);
int cap_fd = dup(1);
EXPECT_OK(cap_fd);
EXPECT_OK(cap_rights_limit(cap_fd, &r_0));
EXPECT_NOTCAPABLE(write(cap_fd, "", 0));
EXPECT_OK(cap_enter()); // Enter capability mode
EXPECT_NOTCAPABLE(write(cap_fd, "", 0));
// Create a new capability which does have write permission
cap_rights_t r_ws;
cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
int cap_fd2 = dup(1);
EXPECT_OK(cap_fd2);
EXPECT_OK(cap_rights_limit(cap_fd2, &r_ws));
EXPECT_OK(write(cap_fd2, "", 0));
// Tidy up.
if (cap_fd >= 0) close(cap_fd);
if (cap_fd2 >= 0) close(cap_fd2);
}
FORK_TEST_ON(Capability, OpenAtDirectoryTraversal, TmpFile("cap_openat_testfile")) {
int dir = open(tmpdir.c_str(), O_RDONLY);
EXPECT_OK(dir);
cap_enter();
int file = openat(dir, "cap_openat_testfile", O_RDONLY|O_CREAT, 0644);
EXPECT_OK(file);
// Test that we are confined to /tmp, and cannot
// escape using absolute paths or ../.
int new_file = openat(dir, "../dev/null", O_RDONLY);
EXPECT_EQ(-1, new_file);
new_file = openat(dir, "..", O_RDONLY);
EXPECT_EQ(-1, new_file);
new_file = openat(dir, "/dev/null", O_RDONLY);
EXPECT_EQ(-1, new_file);
new_file = openat(dir, "/", O_RDONLY);
EXPECT_EQ(-1, new_file);
// Tidy up.
close(file);
close(dir);
}
FORK_TEST_ON(Capability, FileInSync, TmpFile("cap_file_sync")) {
int fd = open(TmpFile("cap_file_sync"), O_RDWR|O_CREAT, 0644);
EXPECT_OK(fd);
const char* message = "Hello capability world";
EXPECT_OK(write(fd, message, strlen(message)));
cap_rights_t r_rsstat;
cap_rights_init(&r_rsstat, CAP_READ, CAP_SEEK, CAP_FSTAT);
int cap_fd = dup(fd);
EXPECT_OK(cap_fd);
EXPECT_OK(cap_rights_limit(cap_fd, &r_rsstat));
int cap_cap_fd = dup(cap_fd);
EXPECT_OK(cap_cap_fd);
EXPECT_OK(cap_rights_limit(cap_cap_fd, &r_rsstat));
EXPECT_OK(cap_enter()); // Enter capability mode.
// Changes to one file descriptor affect the others.
EXPECT_EQ(1, lseek(fd, 1, SEEK_SET));
EXPECT_EQ(1, lseek(fd, 0, SEEK_CUR));
EXPECT_EQ(1, lseek(cap_fd, 0, SEEK_CUR));
EXPECT_EQ(1, lseek(cap_cap_fd, 0, SEEK_CUR));
EXPECT_EQ(3, lseek(cap_fd, 3, SEEK_SET));
EXPECT_EQ(3, lseek(fd, 0, SEEK_CUR));
EXPECT_EQ(3, lseek(cap_fd, 0, SEEK_CUR));
EXPECT_EQ(3, lseek(cap_cap_fd, 0, SEEK_CUR));
EXPECT_EQ(5, lseek(cap_cap_fd, 5, SEEK_SET));
EXPECT_EQ(5, lseek(fd, 0, SEEK_CUR));
EXPECT_EQ(5, lseek(cap_fd, 0, SEEK_CUR));
EXPECT_EQ(5, lseek(cap_cap_fd, 0, SEEK_CUR));
close(cap_cap_fd);
close(cap_fd);
close(fd);
}
// Create a capability on /tmp that does not allow CAP_WRITE,
// and check that this restriction is inherited through openat().
FORK_TEST_ON(Capability, Inheritance, TmpFile("cap_openat_write_testfile")) {
int dir = open(tmpdir.c_str(), O_RDONLY);
EXPECT_OK(dir);
cap_rights_t r_rl;
cap_rights_init(&r_rl, CAP_READ, CAP_LOOKUP);
int cap_dir = dup(dir);
EXPECT_OK(cap_dir);
EXPECT_OK(cap_rights_limit(cap_dir, &r_rl));
const char *filename = "cap_openat_write_testfile";
int file = openat(dir, filename, O_WRONLY|O_CREAT, 0644);
EXPECT_OK(file);
EXPECT_EQ(5, write(file, "TEST\n", 5));
if (file >= 0) close(file);
EXPECT_OK(cap_enter());
file = openat(cap_dir, filename, O_RDONLY);
EXPECT_OK(file);
cap_rights_t rights;
cap_rights_init(&rights, 0);
EXPECT_OK(cap_rights_get(file, &rights));
EXPECT_RIGHTS_EQ(&r_rl, &rights);
if (file >= 0) close(file);
file = openat(cap_dir, filename, O_WRONLY|O_APPEND);
EXPECT_NOTCAPABLE(file);
if (file > 0) close(file);
if (dir > 0) close(dir);
if (cap_dir > 0) close(cap_dir);
}
// Ensure that, if the capability had enough rights for the system call to
// pass, then it did. Otherwise, ensure that the errno is ENOTCAPABLE;
// capability restrictions should kick in before any other error logic.
#define CHECK_RIGHT_RESULT(result, rights, ...) do { \
cap_rights_t rights_needed; \
cap_rights_init(&rights_needed, __VA_ARGS__); \
if (cap_rights_contains(&rights, &rights_needed)) { \
EXPECT_OK(result) << std::endl \
<< " need: " << rights_needed \
<< std::endl \
<< " got: " << rights; \
} else { \
EXPECT_EQ(-1, result) << " need: " << rights_needed \
<< std::endl \
<< " got: "<< rights; \
EXPECT_EQ(ENOTCAPABLE, errno); \
} \
} while (0)
#define EXPECT_MMAP_NOTCAPABLE(result) do { \
void *rv = result; \
EXPECT_EQ(MAP_FAILED, rv); \
EXPECT_EQ(ENOTCAPABLE, errno); \
if (rv != MAP_FAILED) munmap(rv, getpagesize()); \
} while (0)
#define EXPECT_MMAP_OK(result) do { \
void *rv = result; \
EXPECT_NE(MAP_FAILED, rv) << " with errno " << errno; \
if (rv != MAP_FAILED) munmap(rv, getpagesize()); \
} while (0)
// As above, but for the special mmap() case: unmap after successful mmap().
#define CHECK_RIGHT_MMAP_RESULT(result, rights, ...) do { \
cap_rights_t rights_needed; \
cap_rights_init(&rights_needed, __VA_ARGS__); \
if (cap_rights_contains(&rights, &rights_needed)) { \
EXPECT_MMAP_OK(result); \
} else { \
EXPECT_MMAP_NOTCAPABLE(result); \
} \
} while (0)
FORK_TEST_ON(Capability, Mmap, TmpFile("cap_mmap_operations")) {
int fd = open(TmpFile("cap_mmap_operations"), O_RDWR | O_CREAT, 0644);
EXPECT_OK(fd);
if (fd < 0) return;
cap_rights_t r_0;
cap_rights_init(&r_0, 0);
cap_rights_t r_mmap;
cap_rights_init(&r_mmap, CAP_MMAP);
cap_rights_t r_r;
cap_rights_init(&r_r, CAP_PREAD);
cap_rights_t r_rmmap;
cap_rights_init(&r_rmmap, CAP_PREAD, CAP_MMAP);
// If we're missing a capability, it will fail.
int cap_none = dup(fd);
EXPECT_OK(cap_none);
EXPECT_OK(cap_rights_limit(cap_none, &r_0));
int cap_mmap = dup(fd);
EXPECT_OK(cap_mmap);
EXPECT_OK(cap_rights_limit(cap_mmap, &r_mmap));
int cap_read = dup(fd);
EXPECT_OK(cap_read);
EXPECT_OK(cap_rights_limit(cap_read, &r_r));
int cap_both = dup(fd);
EXPECT_OK(cap_both);
EXPECT_OK(cap_rights_limit(cap_both, &r_rmmap));
EXPECT_OK(cap_enter()); // Enter capability mode.
EXPECT_MMAP_NOTCAPABLE(mmap(NULL, getpagesize(), PROT_READ, MAP_PRIVATE, cap_none, 0));
EXPECT_MMAP_NOTCAPABLE(mmap(NULL, getpagesize(), PROT_READ, MAP_PRIVATE, cap_mmap, 0));
EXPECT_MMAP_NOTCAPABLE(mmap(NULL, getpagesize(), PROT_READ, MAP_PRIVATE, cap_read, 0));
EXPECT_MMAP_OK(mmap(NULL, getpagesize(), PROT_READ, MAP_PRIVATE, cap_both, 0));
// A call with MAP_ANONYMOUS should succeed without any capability requirements.
EXPECT_MMAP_OK(mmap(NULL, getpagesize(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0));
EXPECT_OK(close(cap_both));
EXPECT_OK(close(cap_read));
EXPECT_OK(close(cap_mmap));
EXPECT_OK(close(cap_none));
EXPECT_OK(close(fd));
}
// Given a file descriptor, create a capability with specific rights and
// make sure only those rights work.
#define TRY_FILE_OPS(fd, ...) do { \
SCOPED_TRACE(#__VA_ARGS__); \
cap_rights_t rights; \
cap_rights_init(&rights, __VA_ARGS__); \
TryFileOps((fd), rights); \
} while (0)
static void TryFileOps(int fd, cap_rights_t rights) {
int cap_fd = dup(fd);
EXPECT_OK(cap_fd);
EXPECT_OK(cap_rights_limit(cap_fd, &rights));
if (cap_fd < 0) return;
cap_rights_t erights;
EXPECT_OK(cap_rights_get(cap_fd, &erights));
EXPECT_RIGHTS_EQ(&rights, &erights);
// Check creation of a capability from a capability.
int cap_cap_fd = dup(cap_fd);
EXPECT_OK(cap_cap_fd);
EXPECT_OK(cap_rights_limit(cap_cap_fd, &rights));
EXPECT_NE(cap_fd, cap_cap_fd);
EXPECT_OK(cap_rights_get(cap_cap_fd, &erights));
EXPECT_RIGHTS_EQ(&rights, &erights);
close(cap_cap_fd);
char ch;
CHECK_RIGHT_RESULT(read(cap_fd, &ch, sizeof(ch)), rights, CAP_READ, CAP_SEEK_ASWAS);
ssize_t len1 = pread(cap_fd, &ch, sizeof(ch), 0);
CHECK_RIGHT_RESULT(len1, rights, CAP_PREAD);
ssize_t len2 = pread(cap_fd, &ch, sizeof(ch), 0);
CHECK_RIGHT_RESULT(len2, rights, CAP_PREAD);
EXPECT_EQ(len1, len2);
CHECK_RIGHT_RESULT(write(cap_fd, &ch, sizeof(ch)), rights, CAP_WRITE, CAP_SEEK_ASWAS);
CHECK_RIGHT_RESULT(pwrite(cap_fd, &ch, sizeof(ch), 0), rights, CAP_PWRITE);
CHECK_RIGHT_RESULT(lseek(cap_fd, 0, SEEK_SET), rights, CAP_SEEK);
#ifdef HAVE_CHFLAGS
// Note: this is not expected to work over NFS.
struct statfs sf;
EXPECT_OK(fstatfs(fd, &sf));
bool is_nfs = (strncmp("nfs", sf.f_fstypename, sizeof(sf.f_fstypename)) == 0);
if (!is_nfs) {
CHECK_RIGHT_RESULT(fchflags(cap_fd, UF_NODUMP), rights, CAP_FCHFLAGS);
}
#endif
CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_NONE, MAP_SHARED, cap_fd, 0),
rights, CAP_MMAP);
CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_READ, MAP_SHARED, cap_fd, 0),
rights, CAP_MMAP_R);
CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_WRITE, MAP_SHARED, cap_fd, 0),
rights, CAP_MMAP_W);
CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_EXEC, MAP_SHARED, cap_fd, 0),
rights, CAP_MMAP_X);
CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_SHARED, cap_fd, 0),
rights, CAP_MMAP_RW);
CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_READ | PROT_EXEC, MAP_SHARED, cap_fd, 0),
rights, CAP_MMAP_RX);
CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_EXEC | PROT_WRITE, MAP_SHARED, cap_fd, 0),
rights, CAP_MMAP_WX);
CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE | PROT_EXEC, MAP_SHARED, cap_fd, 0),
rights, CAP_MMAP_RWX);
CHECK_RIGHT_RESULT(fsync(cap_fd), rights, CAP_FSYNC);
#ifdef HAVE_SYNC_FILE_RANGE
CHECK_RIGHT_RESULT(sync_file_range(cap_fd, 0, 1, 0), rights, CAP_FSYNC, CAP_SEEK);
#endif
int rc = fcntl(cap_fd, F_GETFL);
CHECK_RIGHT_RESULT(rc, rights, CAP_FCNTL);
rc = fcntl(cap_fd, F_SETFL, rc);
CHECK_RIGHT_RESULT(rc, rights, CAP_FCNTL);
CHECK_RIGHT_RESULT(fchown(cap_fd, -1, -1), rights, CAP_FCHOWN);
CHECK_RIGHT_RESULT(fchmod(cap_fd, 0644), rights, CAP_FCHMOD);
CHECK_RIGHT_RESULT(flock(cap_fd, LOCK_SH), rights, CAP_FLOCK);
CHECK_RIGHT_RESULT(flock(cap_fd, LOCK_UN), rights, CAP_FLOCK);
CHECK_RIGHT_RESULT(ftruncate(cap_fd, 0), rights, CAP_FTRUNCATE);
struct stat sb;
CHECK_RIGHT_RESULT(fstat(cap_fd, &sb), rights, CAP_FSTAT);
struct statfs cap_sf;
CHECK_RIGHT_RESULT(fstatfs(cap_fd, &cap_sf), rights, CAP_FSTATFS);
#ifdef HAVE_FPATHCONF
CHECK_RIGHT_RESULT(fpathconf(cap_fd, _PC_NAME_MAX), rights, CAP_FPATHCONF);
#endif
CHECK_RIGHT_RESULT(futimes(cap_fd, NULL), rights, CAP_FUTIMES);
struct pollfd pollfd;
pollfd.fd = cap_fd;
pollfd.events = POLLIN | POLLERR | POLLHUP;
pollfd.revents = 0;
int ret = poll(&pollfd, 1, 0);
if (cap_rights_is_set(&rights, CAP_EVENT)) {
EXPECT_OK(ret);
} else {
EXPECT_NE(0, (pollfd.revents & POLLNVAL));
}
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 100;
fd_set rset;
FD_ZERO(&rset);
FD_SET(cap_fd, &rset);
fd_set wset;
FD_ZERO(&wset);
FD_SET(cap_fd, &wset);
ret = select(cap_fd+1, &rset, &wset, NULL, &tv);
if (cap_rights_is_set(&rights, CAP_EVENT)) {
EXPECT_OK(ret);
} else {
EXPECT_NOTCAPABLE(ret);
}
// TODO(FreeBSD): kqueue
EXPECT_OK(close(cap_fd));
}
FORK_TEST_ON(Capability, Operations, TmpFile("cap_fd_operations")) {
int fd = open(TmpFile("cap_fd_operations"), O_RDWR | O_CREAT, 0644);
EXPECT_OK(fd);
if (fd < 0) return;
EXPECT_OK(cap_enter()); // Enter capability mode.
// Try a variety of different combinations of rights - a full
// enumeration is too large (2^N with N~30+) to perform.
TRY_FILE_OPS(fd, CAP_READ);
TRY_FILE_OPS(fd, CAP_PREAD);
TRY_FILE_OPS(fd, CAP_WRITE);
TRY_FILE_OPS(fd, CAP_PWRITE);
TRY_FILE_OPS(fd, CAP_READ, CAP_WRITE);
TRY_FILE_OPS(fd, CAP_PREAD, CAP_PWRITE);
TRY_FILE_OPS(fd, CAP_SEEK);
TRY_FILE_OPS(fd, CAP_FCHFLAGS);
TRY_FILE_OPS(fd, CAP_IOCTL);
TRY_FILE_OPS(fd, CAP_FSTAT);
TRY_FILE_OPS(fd, CAP_MMAP);
TRY_FILE_OPS(fd, CAP_MMAP_R);
TRY_FILE_OPS(fd, CAP_MMAP_W);
TRY_FILE_OPS(fd, CAP_MMAP_X);
TRY_FILE_OPS(fd, CAP_MMAP_RW);
TRY_FILE_OPS(fd, CAP_MMAP_RX);
TRY_FILE_OPS(fd, CAP_MMAP_WX);
TRY_FILE_OPS(fd, CAP_MMAP_RWX);
TRY_FILE_OPS(fd, CAP_FCNTL);
TRY_FILE_OPS(fd, CAP_EVENT);
TRY_FILE_OPS(fd, CAP_FSYNC);
TRY_FILE_OPS(fd, CAP_FCHOWN);
TRY_FILE_OPS(fd, CAP_FCHMOD);
TRY_FILE_OPS(fd, CAP_FTRUNCATE);
TRY_FILE_OPS(fd, CAP_FLOCK);
TRY_FILE_OPS(fd, CAP_FSTATFS);
TRY_FILE_OPS(fd, CAP_FPATHCONF);
TRY_FILE_OPS(fd, CAP_FUTIMES);
TRY_FILE_OPS(fd, CAP_ACL_GET);
TRY_FILE_OPS(fd, CAP_ACL_SET);
TRY_FILE_OPS(fd, CAP_ACL_DELETE);
TRY_FILE_OPS(fd, CAP_ACL_CHECK);
TRY_FILE_OPS(fd, CAP_EXTATTR_GET);
TRY_FILE_OPS(fd, CAP_EXTATTR_SET);
TRY_FILE_OPS(fd, CAP_EXTATTR_DELETE);
TRY_FILE_OPS(fd, CAP_EXTATTR_LIST);
TRY_FILE_OPS(fd, CAP_MAC_GET);
TRY_FILE_OPS(fd, CAP_MAC_SET);
// Socket-specific.
TRY_FILE_OPS(fd, CAP_GETPEERNAME);
TRY_FILE_OPS(fd, CAP_GETSOCKNAME);
TRY_FILE_OPS(fd, CAP_ACCEPT);
close(fd);
}
#define TRY_DIR_OPS(dfd, ...) do { \
cap_rights_t rights; \
cap_rights_init(&rights, __VA_ARGS__); \
TryDirOps((dfd), rights); \
} while (0)
static void TryDirOps(int dirfd, cap_rights_t rights) {
cap_rights_t erights;
int dfd_cap = dup(dirfd);
EXPECT_OK(dfd_cap);
EXPECT_OK(cap_rights_limit(dfd_cap, &rights));
EXPECT_OK(cap_rights_get(dfd_cap, &erights));
EXPECT_RIGHTS_EQ(&rights, &erights);
int rc = openat(dfd_cap, "cap_create", O_CREAT | O_RDONLY, 0600);
CHECK_RIGHT_RESULT(rc, rights, CAP_CREATE, CAP_READ, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
EXPECT_OK(unlinkat(dirfd, "cap_create", 0));
}
rc = openat(dfd_cap, "cap_create", O_CREAT | O_WRONLY | O_APPEND, 0600);
CHECK_RIGHT_RESULT(rc, rights, CAP_CREATE, CAP_WRITE, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
EXPECT_OK(unlinkat(dirfd, "cap_create", 0));
}
rc = openat(dfd_cap, "cap_create", O_CREAT | O_RDWR | O_APPEND, 0600);
CHECK_RIGHT_RESULT(rc, rights, CAP_CREATE, CAP_READ, CAP_WRITE, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
EXPECT_OK(unlinkat(dirfd, "cap_create", 0));
}
rc = openat(dirfd, "cap_faccess", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = faccessat(dfd_cap, "cap_faccess", F_OK, 0);
CHECK_RIGHT_RESULT(rc, rights, CAP_FSTAT, CAP_LOOKUP);
EXPECT_OK(unlinkat(dirfd, "cap_faccess", 0));
rc = openat(dirfd, "cap_fsync", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = openat(dfd_cap, "cap_fsync", O_FSYNC | O_RDONLY);
CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_READ, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
rc = openat(dfd_cap, "cap_fsync", O_FSYNC | O_WRONLY | O_APPEND);
CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_WRITE, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
rc = openat(dfd_cap, "cap_fsync", O_FSYNC | O_RDWR | O_APPEND);
CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_READ, CAP_WRITE, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
rc = openat(dfd_cap, "cap_fsync", O_SYNC | O_RDONLY);
CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_READ, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
rc = openat(dfd_cap, "cap_fsync", O_SYNC | O_WRONLY | O_APPEND);
CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_WRITE, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
rc = openat(dfd_cap, "cap_fsync", O_SYNC | O_RDWR | O_APPEND);
CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_READ, CAP_WRITE, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
EXPECT_OK(unlinkat(dirfd, "cap_fsync", 0));
rc = openat(dirfd, "cap_ftruncate", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = openat(dfd_cap, "cap_ftruncate", O_TRUNC | O_RDONLY);
CHECK_RIGHT_RESULT(rc, rights, CAP_FTRUNCATE, CAP_READ, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
rc = openat(dfd_cap, "cap_ftruncate", O_TRUNC | O_WRONLY);
CHECK_RIGHT_RESULT(rc, rights, CAP_FTRUNCATE, CAP_WRITE, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
rc = openat(dfd_cap, "cap_ftruncate", O_TRUNC | O_RDWR);
CHECK_RIGHT_RESULT(rc, rights, CAP_FTRUNCATE, CAP_READ, CAP_WRITE, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
EXPECT_OK(unlinkat(dirfd, "cap_ftruncate", 0));
rc = openat(dfd_cap, "cap_create", O_CREAT | O_WRONLY, 0600);
CHECK_RIGHT_RESULT(rc, rights, CAP_CREATE, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
EXPECT_OK(unlinkat(dirfd, "cap_create", 0));
}
rc = openat(dfd_cap, "cap_create", O_CREAT | O_RDWR, 0600);
CHECK_RIGHT_RESULT(rc, rights, CAP_CREATE, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
EXPECT_OK(unlinkat(dirfd, "cap_create", 0));
}
rc = openat(dirfd, "cap_fsync", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = openat(dfd_cap, "cap_fsync", O_FSYNC | O_WRONLY);
CHECK_RIGHT_RESULT(rc,
rights, CAP_FSYNC, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
rc = openat(dfd_cap, "cap_fsync", O_FSYNC | O_RDWR);
CHECK_RIGHT_RESULT(rc,
rights, CAP_FSYNC, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
rc = openat(dfd_cap, "cap_fsync", O_SYNC | O_WRONLY);
CHECK_RIGHT_RESULT(rc,
rights, CAP_FSYNC, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
rc = openat(dfd_cap, "cap_fsync", O_SYNC | O_RDWR);
CHECK_RIGHT_RESULT(rc,
rights, CAP_FSYNC, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(close(rc));
}
EXPECT_OK(unlinkat(dirfd, "cap_fsync", 0));
#ifdef HAVE_CHFLAGSAT
rc = openat(dirfd, "cap_chflagsat", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = chflagsat(dfd_cap, "cap_chflagsat", UF_NODUMP, 0);
CHECK_RIGHT_RESULT(rc, rights, CAP_CHFLAGSAT, CAP_LOOKUP);
EXPECT_OK(unlinkat(dirfd, "cap_chflagsat", 0));
#endif
rc = openat(dirfd, "cap_fchownat", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = fchownat(dfd_cap, "cap_fchownat", -1, -1, 0);
CHECK_RIGHT_RESULT(rc, rights, CAP_FCHOWN, CAP_LOOKUP);
EXPECT_OK(unlinkat(dirfd, "cap_fchownat", 0));
rc = openat(dirfd, "cap_fchmodat", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = fchmodat(dfd_cap, "cap_fchmodat", 0600, 0);
CHECK_RIGHT_RESULT(rc, rights, CAP_FCHMOD, CAP_LOOKUP);
EXPECT_OK(unlinkat(dirfd, "cap_fchmodat", 0));
rc = openat(dirfd, "cap_fstatat", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
struct stat sb;
rc = fstatat(dfd_cap, "cap_fstatat", &sb, 0);
CHECK_RIGHT_RESULT(rc, rights, CAP_FSTAT, CAP_LOOKUP);
EXPECT_OK(unlinkat(dirfd, "cap_fstatat", 0));
rc = openat(dirfd, "cap_futimesat", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = futimesat(dfd_cap, "cap_futimesat", NULL);
CHECK_RIGHT_RESULT(rc, rights, CAP_FUTIMES, CAP_LOOKUP);
EXPECT_OK(unlinkat(dirfd, "cap_futimesat", 0));
// For linkat(2), need:
// - CAP_LINKAT_SOURCE on source
// - CAP_LINKAT_TARGET on destination.
rc = openat(dirfd, "cap_linkat_src", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = linkat(dirfd, "cap_linkat_src", dfd_cap, "cap_linkat_dst", 0);
CHECK_RIGHT_RESULT(rc, rights, CAP_LINKAT_TARGET);
if (rc >= 0) {
EXPECT_OK(unlinkat(dirfd, "cap_linkat_dst", 0));
}
rc = linkat(dfd_cap, "cap_linkat_src", dirfd, "cap_linkat_dst", 0);
CHECK_RIGHT_RESULT(rc, rights, CAP_LINKAT_SOURCE);
if (rc >= 0) {
EXPECT_OK(unlinkat(dirfd, "cap_linkat_dst", 0));
}
EXPECT_OK(unlinkat(dirfd, "cap_linkat_src", 0));
rc = mkdirat(dfd_cap, "cap_mkdirat", 0700);
CHECK_RIGHT_RESULT(rc, rights, CAP_MKDIRAT, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(unlinkat(dirfd, "cap_mkdirat", AT_REMOVEDIR));
}
#ifdef HAVE_MKFIFOAT
rc = mkfifoat(dfd_cap, "cap_mkfifoat", 0600);
CHECK_RIGHT_RESULT(rc, rights, CAP_MKFIFOAT, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(unlinkat(dirfd, "cap_mkfifoat", 0));
}
#endif
if (getuid() == 0) {
rc = mknodat(dfd_cap, "cap_mknodat", S_IFCHR | 0600, 0);
CHECK_RIGHT_RESULT(rc, rights, CAP_MKNODAT, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(unlinkat(dirfd, "cap_mknodat", 0));
}
}
// For renameat(2), need:
// - CAP_RENAMEAT_SOURCE on source
// - CAP_RENAMEAT_TARGET on destination.
rc = openat(dirfd, "cap_renameat_src", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = renameat(dirfd, "cap_renameat_src", dfd_cap, "cap_renameat_dst");
CHECK_RIGHT_RESULT(rc, rights, CAP_RENAMEAT_TARGET);
if (rc >= 0) {
EXPECT_OK(unlinkat(dirfd, "cap_renameat_dst", 0));
} else {
EXPECT_OK(unlinkat(dirfd, "cap_renameat_src", 0));
}
rc = openat(dirfd, "cap_renameat_src", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = renameat(dfd_cap, "cap_renameat_src", dirfd, "cap_renameat_dst");
CHECK_RIGHT_RESULT(rc, rights, CAP_RENAMEAT_SOURCE);
if (rc >= 0) {
EXPECT_OK(unlinkat(dirfd, "cap_renameat_dst", 0));
} else {
EXPECT_OK(unlinkat(dirfd, "cap_renameat_src", 0));
}
rc = symlinkat("test", dfd_cap, "cap_symlinkat");
CHECK_RIGHT_RESULT(rc, rights, CAP_SYMLINKAT, CAP_LOOKUP);
if (rc >= 0) {
EXPECT_OK(unlinkat(dirfd, "cap_symlinkat", 0));
}
rc = openat(dirfd, "cap_unlinkat", O_CREAT, 0600);
EXPECT_OK(rc);
EXPECT_OK(close(rc));
rc = unlinkat(dfd_cap, "cap_unlinkat", 0);
CHECK_RIGHT_RESULT(rc, rights, CAP_UNLINKAT, CAP_LOOKUP);
unlinkat(dirfd, "cap_unlinkat", 0);
EXPECT_OK(mkdirat(dirfd, "cap_unlinkat", 0700));
rc = unlinkat(dfd_cap, "cap_unlinkat", AT_REMOVEDIR);
CHECK_RIGHT_RESULT(rc, rights, CAP_UNLINKAT, CAP_LOOKUP);
unlinkat(dirfd, "cap_unlinkat", AT_REMOVEDIR);
EXPECT_OK(close(dfd_cap));
}
void DirOperationsTest(int extra) {
int rc = mkdir(TmpFile("cap_dirops"), 0755);
EXPECT_OK(rc);
if (rc < 0 && errno != EEXIST) return;
int dfd = open(TmpFile("cap_dirops"), O_RDONLY | O_DIRECTORY | extra);
EXPECT_OK(dfd);
int tmpfd = open(tmpdir.c_str(), O_RDONLY | O_DIRECTORY);
EXPECT_OK(tmpfd);
EXPECT_OK(cap_enter()); // Enter capability mode.
TRY_DIR_OPS(dfd, CAP_LINKAT_SOURCE);
TRY_DIR_OPS(dfd, CAP_LINKAT_TARGET);
TRY_DIR_OPS(dfd, CAP_CREATE, CAP_READ, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_CREATE, CAP_WRITE, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_CREATE, CAP_READ, CAP_WRITE, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_FSYNC, CAP_READ, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_FSYNC, CAP_WRITE, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_FSYNC, CAP_READ, CAP_WRITE, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_FTRUNCATE, CAP_READ, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_FTRUNCATE, CAP_WRITE, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_FTRUNCATE, CAP_READ, CAP_WRITE, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_FCHOWN, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_FCHMOD, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_FSTAT, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_FUTIMES, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_MKDIRAT, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_MKFIFOAT, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_MKNODAT, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_SYMLINKAT, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_UNLINKAT, CAP_LOOKUP);
// Rename needs CAP_RENAMEAT_SOURCE on source directory and
// CAP_RENAMEAT_TARGET on destination directory.
TRY_DIR_OPS(dfd, CAP_RENAMEAT_SOURCE, CAP_UNLINKAT, CAP_LOOKUP);
TRY_DIR_OPS(dfd, CAP_RENAMEAT_TARGET, CAP_UNLINKAT, CAP_LOOKUP);
EXPECT_OK(unlinkat(tmpfd, "cap_dirops", AT_REMOVEDIR));
EXPECT_OK(close(tmpfd));
EXPECT_OK(close(dfd));
}
FORK_TEST(Capability, DirOperations) {
DirOperationsTest(0);
}
#ifdef O_PATH
FORK_TEST(Capability, PathDirOperations) {
// Make the dfd in the test a path-only file descriptor.
DirOperationsTest(O_PATH);
}
#endif
static void TryReadWrite(int cap_fd) {
char buffer[64];
EXPECT_OK(read(cap_fd, buffer, sizeof(buffer)));
int rc = write(cap_fd, "", 0);
EXPECT_EQ(-1, rc);
EXPECT_EQ(ENOTCAPABLE, errno);
}
FORK_TEST_ON(Capability, SocketTransfer, TmpFile("cap_fd_transfer")) {
int sock_fds[2];
EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, sock_fds));