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1 #!/usr/bin/env python
2 #
3 # Copyright (C) 2016 Red Hat, Inc.
4 #
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.
9 #
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.
14 #
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/>.
17 #
18 # Creator/Owner: Daniel P. Berrange <[email protected]>
19 #
20 # Exercise the QEMU 'luks' block driver to validate interoperability
21 # with the Linux dm-crypt + cryptsetup implementation
22
23 from __future__ import print_function
24 import subprocess
25 import os
26 import os.path
27
28 import base64
29
30 import iotests
31
32
33 class LUKSConfig(object):
34     """Represent configuration parameters for a single LUKS
35        setup to be tested"""
36
37     def __init__(self, name, cipher, keylen, mode, ivgen,
38                  ivgen_hash, hash, password=None, passwords=None):
39
40         self.name = name
41         self.cipher = cipher
42         self.keylen = keylen
43         self.mode = mode
44         self.ivgen = ivgen
45         self.ivgen_hash = ivgen_hash
46         self.hash = hash
47
48         if passwords is not None:
49             self.passwords = passwords
50         else:
51             self.passwords = {}
52
53             if password is None:
54                 self.passwords["0"] = "123456"
55             else:
56                 self.passwords["0"] = password
57
58     def __repr__(self):
59         return self.name
60
61     def image_name(self):
62         return "luks-%s.img" % self.name
63
64     def image_path(self):
65         return os.path.join(iotests.test_dir, self.image_name())
66
67     def device_name(self):
68         return "qiotest-145-%s" % self.name
69
70     def device_path(self):
71         return "/dev/mapper/" + self.device_name()
72
73     def first_password(self):
74         for i in range(8):
75             slot = str(i)
76             if slot in self.passwords:
77                 return (self.passwords[slot], slot)
78         raise Exception("No password found")
79
80     def first_password_base64(self):
81         (pw, slot) = self.first_password()
82         return base64.b64encode(pw.encode('ascii')).decode('ascii')
83
84     def active_slots(self):
85         slots = []
86         for i in range(8):
87             slot = str(i)
88             if slot in self.passwords:
89                 slots.append(slot)
90         return slots
91
92 def verify_passwordless_sudo():
93     """Check whether sudo is configured to allow
94        password-less access to commands"""
95
96     args = ["sudo", "-n", "/bin/true"]
97
98     proc = subprocess.Popen(args,
99                             stdin=subprocess.PIPE,
100                             stdout=subprocess.PIPE,
101                             stderr=subprocess.STDOUT,
102                             universal_newlines=True)
103
104     msg = proc.communicate()[0]
105
106     if proc.returncode != 0:
107         iotests.notrun('requires password-less sudo access: %s' % msg)
108
109
110 def cryptsetup(args, password=None):
111     """Run the cryptsetup command in batch mode"""
112
113     fullargs = ["sudo", "cryptsetup", "-q", "-v"]
114     fullargs.extend(args)
115
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)
122
123     msg = proc.communicate(password)[0]
124
125     if proc.returncode != 0:
126         raise Exception(msg)
127
128
129 def cryptsetup_add_password(config, slot):
130     """Add another password to a LUKS key slot"""
131
132     (password, mainslot) = config.first_password()
133
134     pwfile = os.path.join(iotests.test_dir, "passwd.txt")
135     with open(pwfile, "w") as fh:
136         fh.write(config.passwords[slot])
137
138     try:
139         args = ["luksAddKey", config.image_path(),
140                 "--key-slot", slot,
141                 "--key-file", "-",
142                 "--iter-time", "10",
143                 pwfile]
144
145         cryptsetup(args, password)
146     finally:
147         os.unlink(pwfile)
148
149
150 def cryptsetup_format(config):
151     """Format a new LUKS volume with cryptsetup, adding the
152     first key slot only"""
153
154     (password, slot) = config.first_password()
155
156     args = ["luksFormat"]
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)])
165     else:
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())
173
174     cryptsetup(args, password)
175
176
177 def chown(config):
178     """Set the ownership of a open LUKS device to this user"""
179
180     path = config.device_path()
181
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)
188
189     msg = proc.communicate()[0]
190
191     if proc.returncode != 0:
192         raise Exception(msg)
193
194
195 def cryptsetup_open(config):
196     """Open an image as a LUKS device"""
197
198     (password, slot) = config.first_password()
199
200     args = ["luksOpen", config.image_path(), config.device_name()]
201
202     cryptsetup(args, password)
203
204
205 def cryptsetup_close(config):
206     """Close an active LUKS device """
207
208     args = ["luksClose", config.device_name()]
209     cryptsetup(args)
210
211
212 def delete_image(config):
213     """Delete a disk image"""
214
215     try:
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:
220         pass
221
222
223 def create_image(config, size_mb):
224     """Create a bare disk image with requested size"""
225
226     delete_image(config)
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)
231
232
233 def qemu_img_create(config, size_mb):
234     """Create and format a disk image with LUKS using qemu-img"""
235
236     opts = [
237         "key-secret=sec0",
238         "iter-time=10",
239         "cipher-alg=%s-%d" % (config.cipher, config.keylen),
240         "cipher-mode=%s" % config.mode,
241         "ivgen-alg=%s" % config.ivgen,
242         "hash-alg=%s" % config.hash,
243     ]
244     if config.ivgen_hash is not None:
245         opts.append("ivgen-hash-alg=%s" % config.ivgen_hash)
246
247     args = ["create", "-f", "luks",
248             "--object",
249             ("secret,id=sec0,data=%s,format=base64" %
250              config.first_password_base64()),
251             "-o", ",".join(opts),
252             config.image_path(),
253             "%dM" % size_mb]
254
255     iotests.log("qemu-img " + " ".join(args), filters=[iotests.filter_test_dir])
256     iotests.log(iotests.qemu_img_pipe(*args), filters=[iotests.filter_test_dir])
257
258 def qemu_io_image_args(config, dev=False):
259     """Get the args for access an image or device with qemu-io"""
260
261     if dev:
262         return [
263             "--image-opts",
264             "driver=host_device,filename=%s" % config.device_path()]
265     else:
266         return [
267             "--object",
268             ("secret,id=sec0,data=%s,format=base64" %
269              config.first_password_base64()),
270             "--image-opts",
271             ("driver=luks,key-secret=sec0,file.filename=%s" %
272              config.image_path())]
273
274 def qemu_io_write_pattern(config, pattern, offset_mb, size_mb, dev=False):
275     """Write a pattern of data to a LUKS image or device"""
276
277     if dev:
278         chown(config)
279     args = ["-c", "write -P 0x%x %dM %dM" % (pattern, offset_mb, size_mb)]
280     args.extend(qemu_io_image_args(config, dev))
281     iotests.log("qemu-io " + " ".join(args), filters=[iotests.filter_test_dir])
282     iotests.log(iotests.qemu_io(*args), filters=[iotests.filter_test_dir,
283                                                  iotests.filter_qemu_io])
284
285
286 def qemu_io_read_pattern(config, pattern, offset_mb, size_mb, dev=False):
287     """Read a pattern of data to a LUKS image or device"""
288
289     if dev:
290         chown(config)
291     args = ["-c", "read -P 0x%x %dM %dM" % (pattern, offset_mb, size_mb)]
292     args.extend(qemu_io_image_args(config, dev))
293     iotests.log("qemu-io " + " ".join(args), filters=[iotests.filter_test_dir])
294     iotests.log(iotests.qemu_io(*args), filters=[iotests.filter_test_dir,
295                                                  iotests.filter_qemu_io])
296
297
298 def test_once(config, qemu_img=False):
299     """Run the test with a desired LUKS configuration. Can either
300        use qemu-img for creating the initial volume, or cryptsetup,
301        in order to test interoperability in both directions"""
302
303     iotests.log("# ================= %s %s =================" % (
304         "qemu-img" if qemu_img else "dm-crypt", config))
305
306     oneKB = 1024
307     oneMB = oneKB * 1024
308     oneGB = oneMB * 1024
309     oneTB = oneGB * 1024
310
311     # 4 TB, so that we pass the 32-bit sector number boundary.
312     # Important for testing correctness of some IV generators
313     # The files are sparse, so not actually using this much space
314     image_size = 4 * oneTB
315     if qemu_img:
316         iotests.log("# Create image")
317         qemu_img_create(config, image_size // oneMB)
318     else:
319         iotests.log("# Create image")
320         create_image(config, image_size // oneMB)
321
322     lowOffsetMB = 100
323     highOffsetMB = 3 * oneTB // oneMB
324
325     try:
326         if not qemu_img:
327             iotests.log("# Format image")
328             cryptsetup_format(config)
329
330             for slot in config.active_slots()[1:]:
331                 iotests.log("# Add password slot %s" % slot)
332                 cryptsetup_add_password(config, slot)
333
334         # First we'll open the image using cryptsetup and write a
335         # known pattern of data that we'll then verify with QEMU
336
337         iotests.log("# Open dev")
338         cryptsetup_open(config)
339
340         try:
341             iotests.log("# Write test pattern 0xa7")
342             qemu_io_write_pattern(config, 0xa7, lowOffsetMB, 10, dev=True)
343             iotests.log("# Write test pattern 0x13")
344             qemu_io_write_pattern(config, 0x13, highOffsetMB, 10, dev=True)
345         finally:
346             iotests.log("# Close dev")
347             cryptsetup_close(config)
348
349         # Ok, now we're using QEMU to verify the pattern just
350         # written via dm-crypt
351
352         iotests.log("# Read test pattern 0xa7")
353         qemu_io_read_pattern(config, 0xa7, lowOffsetMB, 10, dev=False)
354         iotests.log("# Read test pattern 0x13")
355         qemu_io_read_pattern(config, 0x13, highOffsetMB, 10, dev=False)
356
357
358         # Write a new pattern to the image, which we'll later
359         # verify with dm-crypt
360         iotests.log("# Write test pattern 0x91")
361         qemu_io_write_pattern(config, 0x91, lowOffsetMB, 10, dev=False)
362         iotests.log("# Write test pattern 0x5e")
363         qemu_io_write_pattern(config, 0x5e, highOffsetMB, 10, dev=False)
364
365
366         # Now we're opening the image with dm-crypt once more
367         # and verifying what QEMU wrote, completing the circle
368         iotests.log("# Open dev")
369         cryptsetup_open(config)
370
371         try:
372             iotests.log("# Read test pattern 0x91")
373             qemu_io_read_pattern(config, 0x91, lowOffsetMB, 10, dev=True)
374             iotests.log("# Read test pattern 0x5e")
375             qemu_io_read_pattern(config, 0x5e, highOffsetMB, 10, dev=True)
376         finally:
377             iotests.log("# Close dev")
378             cryptsetup_close(config)
379     finally:
380         iotests.log("# Delete image")
381         delete_image(config)
382         print()
383
384
385 # Obviously we only work with the luks image format
386 iotests.verify_image_format(supported_fmts=['luks'])
387 iotests.verify_platform()
388
389 # We need sudo in order to run cryptsetup to create
390 # dm-crypt devices. This is safe to use on any
391 # machine, since all dm-crypt devices are backed
392 # by newly created plain files, and have a dm-crypt
393 # name prefix of 'qiotest' to avoid clashing with
394 # user LUKS volumes
395 verify_passwordless_sudo()
396
397
398 # If we look at all permutations of cipher, key size,
399 # mode, ivgen, hash, there are ~1000 possible configs.
400 #
401 # We certainly don't want/need to test every permutation
402 # to get good validation of interoperability between QEMU
403 # and dm-crypt/cryptsetup.
404 #
405 # The configs below are a representative set that aim to
406 # exercise each axis of configurability.
407 #
408 configs = [
409     # A common LUKS default
410     LUKSConfig("aes-256-xts-plain64-sha1",
411                "aes", 256, "xts", "plain64", None, "sha1"),
412
413
414     # LUKS default but diff ciphers
415     LUKSConfig("twofish-256-xts-plain64-sha1",
416                "twofish", 256, "xts", "plain64", None, "sha1"),
417     LUKSConfig("serpent-256-xts-plain64-sha1",
418                "serpent", 256, "xts", "plain64", None, "sha1"),
419     # Should really be xts, but kernel doesn't support xts+cast5
420     # nor does it do essiv+cast5
421     LUKSConfig("cast5-128-cbc-plain64-sha1",
422                "cast5", 128, "cbc", "plain64", None, "sha1"),
423     LUKSConfig("cast6-256-xts-plain64-sha1",
424                "cast6", 256, "xts", "plain64", None, "sha1"),
425
426
427     # LUKS default but diff modes / ivgens
428     LUKSConfig("aes-256-cbc-plain-sha1",
429                "aes", 256, "cbc", "plain", None, "sha1"),
430     LUKSConfig("aes-256-cbc-plain64-sha1",
431                "aes", 256, "cbc", "plain64", None, "sha1"),
432     LUKSConfig("aes-256-cbc-essiv-sha256-sha1",
433                "aes", 256, "cbc", "essiv", "sha256", "sha1"),
434     LUKSConfig("aes-256-xts-essiv-sha256-sha1",
435                "aes", 256, "xts", "essiv", "sha256", "sha1"),
436
437
438     # LUKS default but smaller key sizes
439     LUKSConfig("aes-128-xts-plain64-sha256-sha1",
440                "aes", 128, "xts", "plain64", None, "sha1"),
441     LUKSConfig("aes-192-xts-plain64-sha256-sha1",
442                "aes", 192, "xts", "plain64", None, "sha1"),
443
444     LUKSConfig("twofish-128-xts-plain64-sha1",
445                "twofish", 128, "xts", "plain64", None, "sha1"),
446     LUKSConfig("twofish-192-xts-plain64-sha1",
447                "twofish", 192, "xts", "plain64", None, "sha1"),
448
449     LUKSConfig("serpent-128-xts-plain64-sha1",
450                "serpent", 128, "xts", "plain64", None, "sha1"),
451     LUKSConfig("serpent-192-xts-plain64-sha1",
452                "serpent", 192, "xts", "plain64", None, "sha1"),
453
454     LUKSConfig("cast6-128-xts-plain64-sha1",
455                "cast6", 128, "xts", "plain", None, "sha1"),
456     LUKSConfig("cast6-192-xts-plain64-sha1",
457                "cast6", 192, "xts", "plain64", None, "sha1"),
458
459
460     # LUKS default but diff hash
461     LUKSConfig("aes-256-xts-plain64-sha224",
462                "aes", 256, "xts", "plain64", None, "sha224"),
463     LUKSConfig("aes-256-xts-plain64-sha256",
464                "aes", 256, "xts", "plain64", None, "sha256"),
465     LUKSConfig("aes-256-xts-plain64-sha384",
466                "aes", 256, "xts", "plain64", None, "sha384"),
467     LUKSConfig("aes-256-xts-plain64-sha512",
468                "aes", 256, "xts", "plain64", None, "sha512"),
469     LUKSConfig("aes-256-xts-plain64-ripemd160",
470                "aes", 256, "xts", "plain64", None, "ripemd160"),
471
472     # Password in slot 3
473     LUKSConfig("aes-256-xts-plain-sha1-pwslot3",
474                "aes", 256, "xts", "plain", None, "sha1",
475                passwords={
476                    "3": "slot3",
477                }),
478
479     # Passwords in every slot
480     LUKSConfig("aes-256-xts-plain-sha1-pwallslots",
481                "aes", 256, "xts", "plain", None, "sha1",
482                passwords={
483                    "0": "slot1",
484                    "1": "slot1",
485                    "2": "slot2",
486                    "3": "slot3",
487                    "4": "slot4",
488                    "5": "slot5",
489                    "6": "slot6",
490                    "7": "slot7",
491                }),
492
493     # Check handling of default hash alg (sha256) with essiv
494     LUKSConfig("aes-256-cbc-essiv-auto-sha1",
495                "aes", 256, "cbc", "essiv", None, "sha1"),
496
497     # Check that a useless hash provided for 'plain64' iv gen
498     # is ignored and no error raised
499     LUKSConfig("aes-256-cbc-plain64-sha256-sha1",
500                "aes", 256, "cbc", "plain64", "sha256", "sha1"),
501
502 ]
503
504 blacklist = [
505     # We don't have a cast-6 cipher impl for QEMU yet
506     "cast6-256-xts-plain64-sha1",
507     "cast6-128-xts-plain64-sha1",
508     "cast6-192-xts-plain64-sha1",
509
510     # GCrypt doesn't support Twofish with 192 bit key
511     "twofish-192-xts-plain64-sha1",
512 ]
513
514 whitelist = []
515 if "LUKS_CONFIG" in os.environ:
516     whitelist = os.environ["LUKS_CONFIG"].split(",")
517
518 for config in configs:
519     if config.name in blacklist:
520         iotests.log("Skipping %s in blacklist" % config.name)
521         continue
522
523     if len(whitelist) > 0 and config.name not in whitelist:
524         iotests.log("Skipping %s not in whitelist" % config.name)
525         continue
526
527     test_once(config, qemu_img=False)
528
529     # XXX we should support setting passwords in a non-0
530     # key slot with 'qemu-img create' in future
531     (pw, slot) = config.first_password()
532     if slot == "0":
533         test_once(config, qemu_img=True)
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