3 # Copyright (C) 2016 Red Hat, Inc.
5 # This program is free software; you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation; either version 2 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
18 # Creator/Owner: Daniel P. Berrange <berrange@redhat.com>
20 # Exercise the QEMU 'luks' block driver to validate interoperability
21 # with the Linux dm-crypt + cryptsetup implementation
32 class LUKSConfig(object):
33 """Represent configuration parameters for a single LUKS
36 def __init__(self, name, cipher, keylen, mode, ivgen,
37 ivgen_hash, hash, password=None, passwords=None):
44 self.ivgen_hash = ivgen_hash
47 if passwords is not None:
48 self.passwords = passwords
53 self.passwords["0"] = "123456"
55 self.passwords["0"] = password
61 return "luks-%s.img" % self.name
64 return os.path.join(iotests.test_dir, self.image_name())
66 def device_name(self):
67 return "qiotest-145-%s" % self.name
69 def device_path(self):
70 return "/dev/mapper/" + self.device_name()
72 def first_password(self):
75 if slot in self.passwords:
76 return (self.passwords[slot], slot)
77 raise Exception("No password found")
79 def first_password_base64(self):
80 (pw, slot) = self.first_password()
81 return base64.b64encode(pw.encode('ascii')).decode('ascii')
83 def active_slots(self):
87 if slot in self.passwords:
91 def verify_passwordless_sudo():
92 """Check whether sudo is configured to allow
93 password-less access to commands"""
95 args = ["sudo", "-n", "/bin/true"]
97 proc = subprocess.Popen(args,
98 stdin=subprocess.PIPE,
99 stdout=subprocess.PIPE,
100 stderr=subprocess.STDOUT,
101 universal_newlines=True)
103 msg = proc.communicate()[0]
105 if proc.returncode != 0:
106 iotests.notrun('requires password-less sudo access: %s' % msg)
109 def cryptsetup(args, password=None):
110 """Run the cryptsetup command in batch mode"""
112 fullargs = ["sudo", "cryptsetup", "-q", "-v"]
113 fullargs.extend(args)
115 iotests.log(" ".join(fullargs), filters=[iotests.filter_test_dir])
116 proc = subprocess.Popen(fullargs,
117 stdin=subprocess.PIPE,
118 stdout=subprocess.PIPE,
119 stderr=subprocess.STDOUT,
120 universal_newlines=True)
122 msg = proc.communicate(password)[0]
124 if proc.returncode != 0:
128 def cryptsetup_add_password(config, slot):
129 """Add another password to a LUKS key slot"""
131 (password, mainslot) = config.first_password()
133 pwfile = os.path.join(iotests.test_dir, "passwd.txt")
134 with open(pwfile, "w") as fh:
135 fh.write(config.passwords[slot])
138 args = ["luksAddKey", config.image_path(),
144 cryptsetup(args, password)
149 def cryptsetup_format(config):
150 """Format a new LUKS volume with cryptsetup, adding the
151 first key slot only"""
153 (password, slot) = config.first_password()
155 args = ["luksFormat", "--type", "luks1"]
156 cipher = config.cipher + "-" + config.mode + "-" + config.ivgen
157 if config.ivgen_hash is not None:
158 cipher = cipher + ":" + config.ivgen_hash
159 elif config.ivgen == "essiv":
160 cipher = cipher + ":" + "sha256"
161 args.extend(["--cipher", cipher])
162 if config.mode == "xts":
163 args.extend(["--key-size", str(config.keylen * 2)])
165 args.extend(["--key-size", str(config.keylen)])
166 if config.hash is not None:
167 args.extend(["--hash", config.hash])
168 args.extend(["--key-slot", slot])
169 args.extend(["--key-file", "-"])
170 args.extend(["--iter-time", "10"])
171 args.append(config.image_path())
173 cryptsetup(args, password)
177 """Set the ownership of a open LUKS device to this user"""
179 path = config.device_path()
181 args = ["sudo", "chown", "%d:%d" % (os.getuid(), os.getgid()), path]
182 iotests.log(" ".join(args), filters=[iotests.filter_chown])
183 proc = subprocess.Popen(args,
184 stdin=subprocess.PIPE,
185 stdout=subprocess.PIPE,
186 stderr=subprocess.STDOUT)
188 msg = proc.communicate()[0]
190 if proc.returncode != 0:
194 def cryptsetup_open(config):
195 """Open an image as a LUKS device"""
197 (password, slot) = config.first_password()
199 args = ["luksOpen", config.image_path(), config.device_name()]
201 cryptsetup(args, password)
204 def cryptsetup_close(config):
205 """Close an active LUKS device """
207 args = ["luksClose", config.device_name()]
211 def delete_image(config):
212 """Delete a disk image"""
215 os.unlink(config.image_path())
216 iotests.log("unlink %s" % config.image_path(),
217 filters=[iotests.filter_test_dir])
218 except Exception as e:
222 def create_image(config, size_mb):
223 """Create a bare disk image with requested size"""
226 iotests.log("truncate %s --size %dMB" % (config.image_path(), size_mb),
227 filters=[iotests.filter_test_dir])
228 with open(config.image_path(), "w") as fn:
229 fn.truncate(size_mb * 1024 * 1024)
232 def qemu_img_create(config, size_mb):
233 """Create and format a disk image with LUKS using qemu-img"""
238 "cipher-alg=%s-%d" % (config.cipher, config.keylen),
239 "cipher-mode=%s" % config.mode,
240 "ivgen-alg=%s" % config.ivgen,
241 "hash-alg=%s" % config.hash,
243 if config.ivgen_hash is not None:
244 opts.append("ivgen-hash-alg=%s" % config.ivgen_hash)
246 args = ["create", "-f", "luks",
248 ("secret,id=sec0,data=%s,format=base64" %
249 config.first_password_base64()),
250 "-o", ",".join(opts),
254 iotests.log("qemu-img " + " ".join(args), filters=[iotests.filter_test_dir])
255 iotests.log(iotests.qemu_img_pipe(*args), filters=[iotests.filter_test_dir])
257 def qemu_io_image_args(config, dev=False):
258 """Get the args for access an image or device with qemu-io"""
263 "driver=host_device,filename=%s" % config.device_path()]
267 ("secret,id=sec0,data=%s,format=base64" %
268 config.first_password_base64()),
270 ("driver=luks,key-secret=sec0,file.filename=%s" %
271 config.image_path())]
273 def qemu_io_write_pattern(config, pattern, offset_mb, size_mb, dev=False):
274 """Write a pattern of data to a LUKS image or device"""
278 args = ["-c", "write -P 0x%x %dM %dM" % (pattern, offset_mb, size_mb)]
279 args.extend(qemu_io_image_args(config, dev))
280 iotests.log("qemu-io " + " ".join(args), filters=[iotests.filter_test_dir])
281 iotests.log(iotests.qemu_io(*args), filters=[iotests.filter_test_dir,
282 iotests.filter_qemu_io])
285 def qemu_io_read_pattern(config, pattern, offset_mb, size_mb, dev=False):
286 """Read a pattern of data to a LUKS image or device"""
290 args = ["-c", "read -P 0x%x %dM %dM" % (pattern, offset_mb, size_mb)]
291 args.extend(qemu_io_image_args(config, dev))
292 iotests.log("qemu-io " + " ".join(args), filters=[iotests.filter_test_dir])
293 iotests.log(iotests.qemu_io(*args), filters=[iotests.filter_test_dir,
294 iotests.filter_qemu_io])
297 def test_once(config, qemu_img=False):
298 """Run the test with a desired LUKS configuration. Can either
299 use qemu-img for creating the initial volume, or cryptsetup,
300 in order to test interoperability in both directions"""
302 iotests.log("# ================= %s %s =================" % (
303 "qemu-img" if qemu_img else "dm-crypt", config))
310 # 4 TB, so that we pass the 32-bit sector number boundary.
311 # Important for testing correctness of some IV generators
312 # The files are sparse, so not actually using this much space
313 image_size = 4 * oneTB
315 iotests.log("# Create image")
316 qemu_img_create(config, image_size // oneMB)
318 iotests.log("# Create image")
319 create_image(config, image_size // oneMB)
322 highOffsetMB = 3 * oneTB // oneMB
326 iotests.log("# Format image")
327 cryptsetup_format(config)
329 for slot in config.active_slots()[1:]:
330 iotests.log("# Add password slot %s" % slot)
331 cryptsetup_add_password(config, slot)
333 # First we'll open the image using cryptsetup and write a
334 # known pattern of data that we'll then verify with QEMU
336 iotests.log("# Open dev")
337 cryptsetup_open(config)
340 iotests.log("# Write test pattern 0xa7")
341 qemu_io_write_pattern(config, 0xa7, lowOffsetMB, 10, dev=True)
342 iotests.log("# Write test pattern 0x13")
343 qemu_io_write_pattern(config, 0x13, highOffsetMB, 10, dev=True)
345 iotests.log("# Close dev")
346 cryptsetup_close(config)
348 # Ok, now we're using QEMU to verify the pattern just
349 # written via dm-crypt
351 iotests.log("# Read test pattern 0xa7")
352 qemu_io_read_pattern(config, 0xa7, lowOffsetMB, 10, dev=False)
353 iotests.log("# Read test pattern 0x13")
354 qemu_io_read_pattern(config, 0x13, highOffsetMB, 10, dev=False)
357 # Write a new pattern to the image, which we'll later
358 # verify with dm-crypt
359 iotests.log("# Write test pattern 0x91")
360 qemu_io_write_pattern(config, 0x91, lowOffsetMB, 10, dev=False)
361 iotests.log("# Write test pattern 0x5e")
362 qemu_io_write_pattern(config, 0x5e, highOffsetMB, 10, dev=False)
365 # Now we're opening the image with dm-crypt once more
366 # and verifying what QEMU wrote, completing the circle
367 iotests.log("# Open dev")
368 cryptsetup_open(config)
371 iotests.log("# Read test pattern 0x91")
372 qemu_io_read_pattern(config, 0x91, lowOffsetMB, 10, dev=True)
373 iotests.log("# Read test pattern 0x5e")
374 qemu_io_read_pattern(config, 0x5e, highOffsetMB, 10, dev=True)
376 iotests.log("# Close dev")
377 cryptsetup_close(config)
379 iotests.log("# Delete image")
384 # Obviously we only work with the luks image format
385 iotests.script_initialize(supported_fmts=['luks'])
387 # We need sudo in order to run cryptsetup to create
388 # dm-crypt devices. This is safe to use on any
389 # machine, since all dm-crypt devices are backed
390 # by newly created plain files, and have a dm-crypt
391 # name prefix of 'qiotest' to avoid clashing with
393 verify_passwordless_sudo()
396 # If we look at all permutations of cipher, key size,
397 # mode, ivgen, hash, there are ~1000 possible configs.
399 # We certainly don't want/need to test every permutation
400 # to get good validation of interoperability between QEMU
401 # and dm-crypt/cryptsetup.
403 # The configs below are a representative set that aim to
404 # exercise each axis of configurability.
407 # A common LUKS default
408 LUKSConfig("aes-256-xts-plain64-sha1",
409 "aes", 256, "xts", "plain64", None, "sha1"),
412 # LUKS default but diff ciphers
413 LUKSConfig("twofish-256-xts-plain64-sha1",
414 "twofish", 256, "xts", "plain64", None, "sha1"),
415 LUKSConfig("serpent-256-xts-plain64-sha1",
416 "serpent", 256, "xts", "plain64", None, "sha1"),
417 # Should really be xts, but kernel doesn't support xts+cast5
418 # nor does it do essiv+cast5
419 LUKSConfig("cast5-128-cbc-plain64-sha1",
420 "cast5", 128, "cbc", "plain64", None, "sha1"),
421 LUKSConfig("cast6-256-xts-plain64-sha1",
422 "cast6", 256, "xts", "plain64", None, "sha1"),
425 # LUKS default but diff modes / ivgens
426 LUKSConfig("aes-256-cbc-plain-sha1",
427 "aes", 256, "cbc", "plain", None, "sha1"),
428 LUKSConfig("aes-256-cbc-plain64-sha1",
429 "aes", 256, "cbc", "plain64", None, "sha1"),
430 LUKSConfig("aes-256-cbc-essiv-sha256-sha1",
431 "aes", 256, "cbc", "essiv", "sha256", "sha1"),
432 LUKSConfig("aes-256-xts-essiv-sha256-sha1",
433 "aes", 256, "xts", "essiv", "sha256", "sha1"),
436 # LUKS default but smaller key sizes
437 LUKSConfig("aes-128-xts-plain64-sha256-sha1",
438 "aes", 128, "xts", "plain64", None, "sha1"),
439 LUKSConfig("aes-192-xts-plain64-sha256-sha1",
440 "aes", 192, "xts", "plain64", None, "sha1"),
442 LUKSConfig("twofish-128-xts-plain64-sha1",
443 "twofish", 128, "xts", "plain64", None, "sha1"),
444 LUKSConfig("twofish-192-xts-plain64-sha1",
445 "twofish", 192, "xts", "plain64", None, "sha1"),
447 LUKSConfig("serpent-128-xts-plain64-sha1",
448 "serpent", 128, "xts", "plain64", None, "sha1"),
449 LUKSConfig("serpent-192-xts-plain64-sha1",
450 "serpent", 192, "xts", "plain64", None, "sha1"),
452 LUKSConfig("cast6-128-xts-plain64-sha1",
453 "cast6", 128, "xts", "plain", None, "sha1"),
454 LUKSConfig("cast6-192-xts-plain64-sha1",
455 "cast6", 192, "xts", "plain64", None, "sha1"),
458 # LUKS default but diff hash
459 LUKSConfig("aes-256-xts-plain64-sha224",
460 "aes", 256, "xts", "plain64", None, "sha224"),
461 LUKSConfig("aes-256-xts-plain64-sha256",
462 "aes", 256, "xts", "plain64", None, "sha256"),
463 LUKSConfig("aes-256-xts-plain64-sha384",
464 "aes", 256, "xts", "plain64", None, "sha384"),
465 LUKSConfig("aes-256-xts-plain64-sha512",
466 "aes", 256, "xts", "plain64", None, "sha512"),
467 LUKSConfig("aes-256-xts-plain64-ripemd160",
468 "aes", 256, "xts", "plain64", None, "ripemd160"),
471 LUKSConfig("aes-256-xts-plain-sha1-pwslot3",
472 "aes", 256, "xts", "plain", None, "sha1",
477 # Passwords in every slot
478 LUKSConfig("aes-256-xts-plain-sha1-pwallslots",
479 "aes", 256, "xts", "plain", None, "sha1",
491 # Check handling of default hash alg (sha256) with essiv
492 LUKSConfig("aes-256-cbc-essiv-auto-sha1",
493 "aes", 256, "cbc", "essiv", None, "sha1"),
495 # Check that a useless hash provided for 'plain64' iv gen
496 # is ignored and no error raised
497 LUKSConfig("aes-256-cbc-plain64-sha256-sha1",
498 "aes", 256, "cbc", "plain64", "sha256", "sha1"),
503 # We don't have a cast-6 cipher impl for QEMU yet
504 "cast6-256-xts-plain64-sha1",
505 "cast6-128-xts-plain64-sha1",
506 "cast6-192-xts-plain64-sha1",
508 # GCrypt doesn't support Twofish with 192 bit key
509 "twofish-192-xts-plain64-sha1",
513 if "LUKS_CONFIG" in os.environ:
514 whitelist = os.environ["LUKS_CONFIG"].split(",")
516 for config in configs:
517 if config.name in blacklist:
518 iotests.log("Skipping %s in blacklist" % config.name)
521 if len(whitelist) > 0 and config.name not in whitelist:
522 iotests.log("Skipping %s not in whitelist" % config.name)
525 test_once(config, qemu_img=False)
527 # XXX we should support setting passwords in a non-0
528 # key slot with 'qemu-img create' in future
529 (pw, slot) = config.first_password()
531 test_once(config, qemu_img=True)