4 # Copyright (C) 2016 Red Hat, Inc.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
19 # Creator/Owner: Daniel P. Berrange <berrange@redhat.com>
21 # Exercise the QEMU 'luks' block driver to validate interoperability
22 # with the Linux dm-crypt + cryptsetup implementation
33 class LUKSConfig(object):
34 """Represent configuration parameters for a single LUKS
37 def __init__(self, name, cipher, keylen, mode, ivgen,
38 ivgen_hash, hash, password=None, passwords=None):
45 self.ivgen_hash = ivgen_hash
48 if passwords is not None:
49 self.passwords = passwords
54 self.passwords["0"] = "123456"
56 self.passwords["0"] = password
62 return "luks-%s.img" % self.name
65 return os.path.join(iotests.test_dir, self.image_name())
67 def device_name(self):
68 return "qiotest-145-%s" % self.name
70 def device_path(self):
71 return "/dev/mapper/" + self.device_name()
73 def first_password(self):
76 if slot in self.passwords:
77 return (self.passwords[slot], slot)
78 raise Exception("No password found")
80 def first_password_base64(self):
81 (pw, slot) = self.first_password()
82 return base64.b64encode(pw.encode('ascii')).decode('ascii')
84 def active_slots(self):
88 if slot in self.passwords:
92 def verify_passwordless_sudo():
93 """Check whether sudo is configured to allow
94 password-less access to commands"""
96 args = ["sudo", "-n", "/bin/true"]
98 proc = subprocess.Popen(args,
99 stdin=subprocess.PIPE,
100 stdout=subprocess.PIPE,
101 stderr=subprocess.STDOUT,
102 universal_newlines=True)
104 msg = proc.communicate()[0]
106 if proc.returncode != 0:
107 iotests.notrun('requires password-less sudo access: %s' % msg)
110 def cryptsetup(args, password=None):
111 """Run the cryptsetup command in batch mode"""
113 fullargs = ["sudo", "cryptsetup", "-q", "-v"]
114 fullargs.extend(args)
116 iotests.log(" ".join(fullargs), filters=[iotests.filter_test_dir])
117 proc = subprocess.Popen(fullargs,
118 stdin=subprocess.PIPE,
119 stdout=subprocess.PIPE,
120 stderr=subprocess.STDOUT,
121 universal_newlines=True)
123 msg = proc.communicate(password)[0]
125 if proc.returncode != 0:
129 def cryptsetup_add_password(config, slot):
130 """Add another password to a LUKS key slot"""
132 (password, mainslot) = config.first_password()
134 pwfile = os.path.join(iotests.test_dir, "passwd.txt")
135 with open(pwfile, "w") as fh:
136 fh.write(config.passwords[slot])
139 args = ["luksAddKey", config.image_path(),
145 cryptsetup(args, password)
150 def cryptsetup_format(config):
151 """Format a new LUKS volume with cryptsetup, adding the
152 first key slot only"""
154 (password, slot) = config.first_password()
156 args = ["luksFormat", "--type", "luks1"]
157 cipher = config.cipher + "-" + config.mode + "-" + config.ivgen
158 if config.ivgen_hash is not None:
159 cipher = cipher + ":" + config.ivgen_hash
160 elif config.ivgen == "essiv":
161 cipher = cipher + ":" + "sha256"
162 args.extend(["--cipher", cipher])
163 if config.mode == "xts":
164 args.extend(["--key-size", str(config.keylen * 2)])
166 args.extend(["--key-size", str(config.keylen)])
167 if config.hash is not None:
168 args.extend(["--hash", config.hash])
169 args.extend(["--key-slot", slot])
170 args.extend(["--key-file", "-"])
171 args.extend(["--iter-time", "10"])
172 args.append(config.image_path())
174 cryptsetup(args, password)
178 """Set the ownership of a open LUKS device to this user"""
180 path = config.device_path()
182 args = ["sudo", "chown", "%d:%d" % (os.getuid(), os.getgid()), path]
183 iotests.log(" ".join(args), filters=[iotests.filter_chown])
184 proc = subprocess.Popen(args,
185 stdin=subprocess.PIPE,
186 stdout=subprocess.PIPE,
187 stderr=subprocess.STDOUT)
189 msg = proc.communicate()[0]
191 if proc.returncode != 0:
195 def cryptsetup_open(config):
196 """Open an image as a LUKS device"""
198 (password, slot) = config.first_password()
200 args = ["luksOpen", config.image_path(), config.device_name()]
202 cryptsetup(args, password)
205 def cryptsetup_close(config):
206 """Close an active LUKS device """
208 args = ["luksClose", config.device_name()]
212 def delete_image(config):
213 """Delete a disk image"""
216 os.unlink(config.image_path())
217 iotests.log("unlink %s" % config.image_path(),
218 filters=[iotests.filter_test_dir])
219 except Exception as e:
223 def create_image(config, size_mb):
224 """Create a bare disk image with requested size"""
227 iotests.log("truncate %s --size %dMB" % (config.image_path(), size_mb),
228 filters=[iotests.filter_test_dir])
229 with open(config.image_path(), "w") as fn:
230 fn.truncate(size_mb * 1024 * 1024)
233 def check_cipher_support(config, output):
234 """Check the output of qemu-img or qemu-io for mention of the respective
235 cipher algorithm being unsupported, and if so, skip this test.
236 (Returns `output` for convenience.)"""
238 if 'Unsupported cipher algorithm' in output:
239 iotests.notrun('Unsupported cipher algorithm '
240 f'{config.cipher}-{config.keylen}-{config.mode}; '
241 'consider configuring qemu with a different crypto '
245 def qemu_img_create(config, size_mb):
246 """Create and format a disk image with LUKS using qemu-img"""
251 "cipher-alg=%s-%d" % (config.cipher, config.keylen),
252 "cipher-mode=%s" % config.mode,
253 "ivgen-alg=%s" % config.ivgen,
254 "hash-alg=%s" % config.hash,
256 if config.ivgen_hash is not None:
257 opts.append("ivgen-hash-alg=%s" % config.ivgen_hash)
259 args = ["create", "-f", "luks",
261 ("secret,id=sec0,data=%s,format=base64" %
262 config.first_password_base64()),
263 "-o", ",".join(opts),
267 iotests.log("qemu-img " + " ".join(args), filters=[iotests.filter_test_dir])
269 iotests.qemu_img(*args)
270 except subprocess.CalledProcessError as exc:
271 check_cipher_support(config, exc.output)
274 def qemu_io_image_args(config, dev=False):
275 """Get the args for access an image or device with qemu-io"""
280 "driver=host_device,filename=%s" % config.device_path()]
284 ("secret,id=sec0,data=%s,format=base64" %
285 config.first_password_base64()),
287 ("driver=luks,key-secret=sec0,file.filename=%s" %
288 config.image_path())]
290 def qemu_io_write_pattern(config, pattern, offset_mb, size_mb, dev=False):
291 """Write a pattern of data to a LUKS image or device"""
295 args = ["-c", "write -P 0x%x %dM %dM" % (pattern, offset_mb, size_mb)]
296 args.extend(qemu_io_image_args(config, dev))
297 iotests.log("qemu-io " + " ".join(args), filters=[iotests.filter_test_dir])
298 output = iotests.qemu_io(*args, check=False).stdout
299 iotests.log(check_cipher_support(config, output),
300 filters=[iotests.filter_test_dir, iotests.filter_qemu_io])
303 def qemu_io_read_pattern(config, pattern, offset_mb, size_mb, dev=False):
304 """Read a pattern of data to a LUKS image or device"""
308 args = ["-c", "read -P 0x%x %dM %dM" % (pattern, offset_mb, size_mb)]
309 args.extend(qemu_io_image_args(config, dev))
310 iotests.log("qemu-io " + " ".join(args), filters=[iotests.filter_test_dir])
311 output = iotests.qemu_io(*args, check=False).stdout
312 iotests.log(check_cipher_support(config, output),
313 filters=[iotests.filter_test_dir, iotests.filter_qemu_io])
316 def test_once(config, qemu_img=False):
317 """Run the test with a desired LUKS configuration. Can either
318 use qemu-img for creating the initial volume, or cryptsetup,
319 in order to test interoperability in both directions"""
321 iotests.log("# ================= %s %s =================" % (
322 "qemu-img" if qemu_img else "dm-crypt", config))
329 # 4 TB, so that we pass the 32-bit sector number boundary.
330 # Important for testing correctness of some IV generators
331 # The files are sparse, so not actually using this much space
332 image_size = 4 * oneTB
334 iotests.log("# Create image")
335 qemu_img_create(config, image_size // oneMB)
337 iotests.log("# Create image")
338 create_image(config, image_size // oneMB)
341 highOffsetMB = 3 * oneTB // oneMB
345 iotests.log("# Format image")
346 cryptsetup_format(config)
348 for slot in config.active_slots()[1:]:
349 iotests.log("# Add password slot %s" % slot)
350 cryptsetup_add_password(config, slot)
352 # First we'll open the image using cryptsetup and write a
353 # known pattern of data that we'll then verify with QEMU
355 iotests.log("# Open dev")
356 cryptsetup_open(config)
359 iotests.log("# Write test pattern 0xa7")
360 qemu_io_write_pattern(config, 0xa7, lowOffsetMB, 10, dev=True)
361 iotests.log("# Write test pattern 0x13")
362 qemu_io_write_pattern(config, 0x13, highOffsetMB, 10, dev=True)
364 iotests.log("# Close dev")
365 cryptsetup_close(config)
367 # Ok, now we're using QEMU to verify the pattern just
368 # written via dm-crypt
370 iotests.log("# Read test pattern 0xa7")
371 qemu_io_read_pattern(config, 0xa7, lowOffsetMB, 10, dev=False)
372 iotests.log("# Read test pattern 0x13")
373 qemu_io_read_pattern(config, 0x13, highOffsetMB, 10, dev=False)
376 # Write a new pattern to the image, which we'll later
377 # verify with dm-crypt
378 iotests.log("# Write test pattern 0x91")
379 qemu_io_write_pattern(config, 0x91, lowOffsetMB, 10, dev=False)
380 iotests.log("# Write test pattern 0x5e")
381 qemu_io_write_pattern(config, 0x5e, highOffsetMB, 10, dev=False)
384 # Now we're opening the image with dm-crypt once more
385 # and verifying what QEMU wrote, completing the circle
386 iotests.log("# Open dev")
387 cryptsetup_open(config)
390 iotests.log("# Read test pattern 0x91")
391 qemu_io_read_pattern(config, 0x91, lowOffsetMB, 10, dev=True)
392 iotests.log("# Read test pattern 0x5e")
393 qemu_io_read_pattern(config, 0x5e, highOffsetMB, 10, dev=True)
395 iotests.log("# Close dev")
396 cryptsetup_close(config)
398 iotests.log("# Delete image")
403 # Obviously we only work with the luks image format
404 iotests.script_initialize(supported_fmts=['luks'])
406 # We need sudo in order to run cryptsetup to create
407 # dm-crypt devices. This is safe to use on any
408 # machine, since all dm-crypt devices are backed
409 # by newly created plain files, and have a dm-crypt
410 # name prefix of 'qiotest' to avoid clashing with
412 verify_passwordless_sudo()
415 # If we look at all permutations of cipher, key size,
416 # mode, ivgen, hash, there are ~1000 possible configs.
418 # We certainly don't want/need to test every permutation
419 # to get good validation of interoperability between QEMU
420 # and dm-crypt/cryptsetup.
422 # The configs below are a representative set that aim to
423 # exercise each axis of configurability.
426 # A common LUKS default
427 LUKSConfig("aes-256-xts-plain64-sha1",
428 "aes", 256, "xts", "plain64", None, "sha1"),
431 # LUKS default but diff ciphers
432 LUKSConfig("twofish-256-xts-plain64-sha1",
433 "twofish", 256, "xts", "plain64", None, "sha1"),
434 LUKSConfig("serpent-256-xts-plain64-sha1",
435 "serpent", 256, "xts", "plain64", None, "sha1"),
436 # Should really be xts, but kernel doesn't support xts+cast5
437 # nor does it do essiv+cast5
438 LUKSConfig("cast5-128-cbc-plain64-sha1",
439 "cast5", 128, "cbc", "plain64", None, "sha1"),
440 LUKSConfig("cast6-256-xts-plain64-sha1",
441 "cast6", 256, "xts", "plain64", None, "sha1"),
444 # LUKS default but diff modes / ivgens
445 LUKSConfig("aes-256-cbc-plain-sha1",
446 "aes", 256, "cbc", "plain", None, "sha1"),
447 LUKSConfig("aes-256-cbc-plain64-sha1",
448 "aes", 256, "cbc", "plain64", None, "sha1"),
449 LUKSConfig("aes-256-cbc-essiv-sha256-sha1",
450 "aes", 256, "cbc", "essiv", "sha256", "sha1"),
451 LUKSConfig("aes-256-xts-essiv-sha256-sha1",
452 "aes", 256, "xts", "essiv", "sha256", "sha1"),
455 # LUKS default but smaller key sizes
456 LUKSConfig("aes-128-xts-plain64-sha256-sha1",
457 "aes", 128, "xts", "plain64", None, "sha1"),
458 LUKSConfig("aes-192-xts-plain64-sha256-sha1",
459 "aes", 192, "xts", "plain64", None, "sha1"),
461 LUKSConfig("twofish-128-xts-plain64-sha1",
462 "twofish", 128, "xts", "plain64", None, "sha1"),
463 LUKSConfig("twofish-192-xts-plain64-sha1",
464 "twofish", 192, "xts", "plain64", None, "sha1"),
466 LUKSConfig("serpent-128-xts-plain64-sha1",
467 "serpent", 128, "xts", "plain64", None, "sha1"),
468 LUKSConfig("serpent-192-xts-plain64-sha1",
469 "serpent", 192, "xts", "plain64", None, "sha1"),
471 LUKSConfig("cast6-128-xts-plain64-sha1",
472 "cast6", 128, "xts", "plain", None, "sha1"),
473 LUKSConfig("cast6-192-xts-plain64-sha1",
474 "cast6", 192, "xts", "plain64", None, "sha1"),
477 # LUKS default but diff hash
478 LUKSConfig("aes-256-xts-plain64-sha224",
479 "aes", 256, "xts", "plain64", None, "sha224"),
480 LUKSConfig("aes-256-xts-plain64-sha256",
481 "aes", 256, "xts", "plain64", None, "sha256"),
482 LUKSConfig("aes-256-xts-plain64-sha384",
483 "aes", 256, "xts", "plain64", None, "sha384"),
484 LUKSConfig("aes-256-xts-plain64-sha512",
485 "aes", 256, "xts", "plain64", None, "sha512"),
486 LUKSConfig("aes-256-xts-plain64-ripemd160",
487 "aes", 256, "xts", "plain64", None, "ripemd160"),
490 LUKSConfig("aes-256-xts-plain-sha1-pwslot3",
491 "aes", 256, "xts", "plain", None, "sha1",
496 # Passwords in every slot
497 LUKSConfig("aes-256-xts-plain-sha1-pwallslots",
498 "aes", 256, "xts", "plain", None, "sha1",
510 # Check handling of default hash alg (sha256) with essiv
511 LUKSConfig("aes-256-cbc-essiv-auto-sha1",
512 "aes", 256, "cbc", "essiv", None, "sha1"),
514 # Check that a useless hash provided for 'plain64' iv gen
515 # is ignored and no error raised
516 LUKSConfig("aes-256-cbc-plain64-sha256-sha1",
517 "aes", 256, "cbc", "plain64", "sha256", "sha1"),
522 # We don't have a cast-6 cipher impl for QEMU yet
523 "cast6-256-xts-plain64-sha1",
524 "cast6-128-xts-plain64-sha1",
525 "cast6-192-xts-plain64-sha1",
527 # GCrypt doesn't support Twofish with 192 bit key
528 "twofish-192-xts-plain64-sha1",
532 if "LUKS_CONFIG" in os.environ:
533 whitelist = os.environ["LUKS_CONFIG"].split(",")
535 for config in configs:
536 if config.name in blacklist:
537 iotests.log("Skipping %s in blacklist" % config.name)
540 if len(whitelist) > 0 and config.name not in whitelist:
541 iotests.log("Skipping %s not in whitelist" % config.name)
544 test_once(config, qemu_img=False)
546 # XXX we should support setting passwords in a non-0
547 # key slot with 'qemu-img create' in future
548 (pw, slot) = config.first_password()
550 test_once(config, qemu_img=True)