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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 import subprocess
24 import os
25 import os.path
26
27 import base64
28
29 import iotests
30
31
32 class LUKSConfig(object):
33     """Represent configuration parameters for a single LUKS
34        setup to be tested"""
35
36     def __init__(self, name, cipher, keylen, mode, ivgen,
37                  ivgen_hash, hash, password=None, passwords=None):
38
39         self.name = name
40         self.cipher = cipher
41         self.keylen = keylen
42         self.mode = mode
43         self.ivgen = ivgen
44         self.ivgen_hash = ivgen_hash
45         self.hash = hash
46
47         if passwords is not None:
48             self.passwords = passwords
49         else:
50             self.passwords = {}
51
52             if password is None:
53                 self.passwords["0"] = "123456"
54             else:
55                 self.passwords["0"] = password
56
57     def __repr__(self):
58         return self.name
59
60     def image_name(self):
61         return "luks-%s.img" % self.name
62
63     def image_path(self):
64         return os.path.join(iotests.test_dir, self.image_name())
65
66     def device_name(self):
67         return "qiotest-145-%s" % self.name
68
69     def device_path(self):
70         return "/dev/mapper/" + self.device_name()
71
72     def first_password(self):
73         for i in range(8):
74             slot = str(i)
75             if slot in self.passwords:
76                 return (self.passwords[slot], slot)
77         raise Exception("No password found")
78
79     def first_password_base64(self):
80         (pw, slot) = self.first_password()
81         return base64.b64encode(pw)
82
83     def active_slots(self):
84         slots = []
85         for i in range(8):
86             slot = str(i)
87             if slot in self.passwords:
88                 slots.append(slot)
89         return slots
90
91 def verify_passwordless_sudo():
92     """Check whether sudo is configured to allow
93        password-less access to commands"""
94
95     args = ["sudo", "-n", "/bin/true"]
96
97     proc = subprocess.Popen(args,
98                             stdin=subprocess.PIPE,
99                             stdout=subprocess.PIPE,
100                             stderr=subprocess.STDOUT)
101
102     msg = proc.communicate()[0]
103
104     if proc.returncode != 0:
105         iotests.notrun('requires password-less sudo access: %s' % msg)
106
107
108 def cryptsetup(args, password=None):
109     """Run the cryptsetup command in batch mode"""
110
111     fullargs = ["sudo", "cryptsetup", "-q", "-v"]
112     fullargs.extend(args)
113
114     iotests.log(" ".join(fullargs), filters=[iotests.filter_test_dir])
115     proc = subprocess.Popen(fullargs,
116                             stdin=subprocess.PIPE,
117                             stdout=subprocess.PIPE,
118                             stderr=subprocess.STDOUT)
119
120     msg = proc.communicate(password)[0]
121
122     if proc.returncode != 0:
123         raise Exception(msg)
124
125
126 def cryptsetup_add_password(config, slot):
127     """Add another password to a LUKS key slot"""
128
129     (password, mainslot) = config.first_password()
130
131     pwfile = os.path.join(iotests.test_dir, "passwd.txt")
132     with open(pwfile, "w") as fh:
133         fh.write(config.passwords[slot])
134
135     try:
136         args = ["luksAddKey", config.image_path(),
137                 "--key-slot", slot,
138                 "--key-file", "-",
139                 "--iter-time", "10",
140                 pwfile]
141
142         cryptsetup(args, password)
143     finally:
144         os.unlink(pwfile)
145
146
147 def cryptsetup_format(config):
148     """Format a new LUKS volume with cryptsetup, adding the
149     first key slot only"""
150
151     (password, slot) = config.first_password()
152
153     args = ["luksFormat"]
154     cipher = config.cipher + "-" + config.mode + "-" + config.ivgen
155     if config.ivgen_hash is not None:
156         cipher = cipher + ":" + config.ivgen_hash
157     elif config.ivgen == "essiv":
158         cipher = cipher + ":" + "sha256"
159     args.extend(["--cipher", cipher])
160     if config.mode == "xts":
161         args.extend(["--key-size", str(config.keylen * 2)])
162     else:
163         args.extend(["--key-size", str(config.keylen)])
164     if config.hash is not None:
165         args.extend(["--hash", config.hash])
166     args.extend(["--key-slot", slot])
167     args.extend(["--key-file", "-"])
168     args.extend(["--iter-time", "10"])
169     args.append(config.image_path())
170
171     cryptsetup(args, password)
172
173
174 def chown(config):
175     """Set the ownership of a open LUKS device to this user"""
176
177     path = config.device_path()
178
179     args = ["sudo", "chown", "%d:%d" % (os.getuid(), os.getgid()), path]
180     iotests.log(" ".join(args), filters=[iotests.filter_chown])
181     proc = subprocess.Popen(args,
182                             stdin=subprocess.PIPE,
183                             stdout=subprocess.PIPE,
184                             stderr=subprocess.STDOUT)
185
186     msg = proc.communicate()[0]
187
188     if proc.returncode != 0:
189         raise Exception(msg)
190
191
192 def cryptsetup_open(config):
193     """Open an image as a LUKS device"""
194
195     (password, slot) = config.first_password()
196
197     args = ["luksOpen", config.image_path(), config.device_name()]
198
199     cryptsetup(args, password)
200
201
202 def cryptsetup_close(config):
203     """Close an active LUKS device """
204
205     args = ["luksClose", config.device_name()]
206     cryptsetup(args)
207
208
209 def delete_image(config):
210     """Delete a disk image"""
211
212     try:
213         os.unlink(config.image_path())
214         iotests.log("unlink %s" % config.image_path(),
215                     filters=[iotests.filter_test_dir])
216     except Exception as e:
217         pass
218
219
220 def create_image(config, size_mb):
221     """Create a bare disk image with requested size"""
222
223     delete_image(config)
224     iotests.log("truncate %s --size %dMB" % (config.image_path(), size_mb),
225                 filters=[iotests.filter_test_dir])
226     with open(config.image_path(), "w") as fn:
227         fn.truncate(size_mb * 1024 * 1024)
228
229
230 def qemu_img_create(config, size_mb):
231     """Create and format a disk image with LUKS using qemu-img"""
232
233     opts = [
234         "key-secret=sec0",
235         "iter-time=10",
236         "cipher-alg=%s-%d" % (config.cipher, config.keylen),
237         "cipher-mode=%s" % config.mode,
238         "ivgen-alg=%s" % config.ivgen,
239         "hash-alg=%s" % config.hash,
240     ]
241     if config.ivgen_hash is not None:
242         opts.append("ivgen-hash-alg=%s" % config.ivgen_hash)
243
244     args = ["create", "-f", "luks",
245             "--object",
246             ("secret,id=sec0,data=%s,format=base64" %
247              config.first_password_base64()),
248             "-o", ",".join(opts),
249             config.image_path(),
250             "%dM" % size_mb]
251
252     iotests.log("qemu-img " + " ".join(args), filters=[iotests.filter_test_dir])
253     iotests.log(iotests.qemu_img_pipe(*args), filters=[iotests.filter_test_dir])
254
255 def qemu_io_image_args(config, dev=False):
256     """Get the args for access an image or device with qemu-io"""
257
258     if dev:
259         return [
260             "--image-opts",
261             "driver=file,filename=%s" % config.device_path()]
262     else:
263         return [
264             "--object",
265             ("secret,id=sec0,data=%s,format=base64" %
266              config.first_password_base64()),
267             "--image-opts",
268             ("driver=luks,key-secret=sec0,file.filename=%s" %
269              config.image_path())]
270
271 def qemu_io_write_pattern(config, pattern, offset_mb, size_mb, dev=False):
272     """Write a pattern of data to a LUKS image or device"""
273
274     if dev:
275         chown(config)
276     args = ["-c", "write -P 0x%x %dM %dM" % (pattern, offset_mb, size_mb)]
277     args.extend(qemu_io_image_args(config, dev))
278     iotests.log("qemu-io " + " ".join(args), filters=[iotests.filter_test_dir])
279     iotests.log(iotests.qemu_io(*args), filters=[iotests.filter_test_dir,
280                                                  iotests.filter_qemu_io])
281
282
283 def qemu_io_read_pattern(config, pattern, offset_mb, size_mb, dev=False):
284     """Read a pattern of data to a LUKS image or device"""
285
286     if dev:
287         chown(config)
288     args = ["-c", "read -P 0x%x %dM %dM" % (pattern, offset_mb, size_mb)]
289     args.extend(qemu_io_image_args(config, dev))
290     iotests.log("qemu-io " + " ".join(args), filters=[iotests.filter_test_dir])
291     iotests.log(iotests.qemu_io(*args), filters=[iotests.filter_test_dir,
292                                                  iotests.filter_qemu_io])
293
294
295 def test_once(config, qemu_img=False):
296     """Run the test with a desired LUKS configuration. Can either
297        use qemu-img for creating the initial volume, or cryptsetup,
298        in order to test interoperability in both directions"""
299
300     iotests.log("# ================= %s %s =================" % (
301         "qemu-img" if qemu_img else "dm-crypt", config))
302
303     oneKB = 1024
304     oneMB = oneKB * 1024
305     oneGB = oneMB * 1024
306     oneTB = oneGB * 1024
307
308     # 4 TB, so that we pass the 32-bit sector number boundary.
309     # Important for testing correctness of some IV generators
310     # The files are sparse, so not actually using this much space
311     image_size = 4 * oneTB
312     if qemu_img:
313         iotests.log("# Create image")
314         qemu_img_create(config, image_size / oneMB)
315     else:
316         iotests.log("# Create image")
317         create_image(config, image_size / oneMB)
318
319     lowOffsetMB = 100
320     highOffsetMB = 3 * oneTB / oneMB
321
322     try:
323         if not qemu_img:
324             iotests.log("# Format image")
325             cryptsetup_format(config)
326
327             for slot in config.active_slots()[1:]:
328                 iotests.log("# Add password slot %s" % slot)
329                 cryptsetup_add_password(config, slot)
330
331         # First we'll open the image using cryptsetup and write a
332         # known pattern of data that we'll then verify with QEMU
333
334         iotests.log("# Open dev")
335         cryptsetup_open(config)
336
337         try:
338             iotests.log("# Write test pattern 0xa7")
339             qemu_io_write_pattern(config, 0xa7, lowOffsetMB, 10, dev=True)
340             iotests.log("# Write test pattern 0x13")
341             qemu_io_write_pattern(config, 0x13, highOffsetMB, 10, dev=True)
342         finally:
343             iotests.log("# Close dev")
344             cryptsetup_close(config)
345
346         # Ok, now we're using QEMU to verify the pattern just
347         # written via dm-crypt
348
349         iotests.log("# Read test pattern 0xa7")
350         qemu_io_read_pattern(config, 0xa7, lowOffsetMB, 10, dev=False)
351         iotests.log("# Read test pattern 0x13")
352         qemu_io_read_pattern(config, 0x13, highOffsetMB, 10, dev=False)
353
354
355         # Write a new pattern to the image, which we'll later
356         # verify with dm-crypt
357         iotests.log("# Write test pattern 0x91")
358         qemu_io_write_pattern(config, 0x91, lowOffsetMB, 10, dev=False)
359         iotests.log("# Write test pattern 0x5e")
360         qemu_io_write_pattern(config, 0x5e, highOffsetMB, 10, dev=False)
361
362
363         # Now we're opening the image with dm-crypt once more
364         # and verifying what QEMU wrote, completing the circle
365         iotests.log("# Open dev")
366         cryptsetup_open(config)
367
368         try:
369             iotests.log("# Read test pattern 0x91")
370             qemu_io_read_pattern(config, 0x91, lowOffsetMB, 10, dev=True)
371             iotests.log("# Read test pattern 0x5e")
372             qemu_io_read_pattern(config, 0x5e, highOffsetMB, 10, dev=True)
373         finally:
374             iotests.log("# Close dev")
375             cryptsetup_close(config)
376     finally:
377         iotests.log("# Delete image")
378         delete_image(config)
379         print
380
381
382 # Obviously we only work with the luks image format
383 iotests.verify_image_format(supported_fmts=['luks'])
384 iotests.verify_platform()
385
386 # We need sudo in order to run cryptsetup to create
387 # dm-crypt devices. This is safe to use on any
388 # machine, since all dm-crypt devices are backed
389 # by newly created plain files, and have a dm-crypt
390 # name prefix of 'qiotest' to avoid clashing with
391 # user LUKS volumes
392 verify_passwordless_sudo()
393
394
395 # If we look at all permutations of cipher, key size,
396 # mode, ivgen, hash, there are ~1000 possible configs.
397 #
398 # We certainly don't want/need to test every permutation
399 # to get good validation of interoperability between QEMU
400 # and dm-crypt/cryptsetup.
401 #
402 # The configs below are a representative set that aim to
403 # exercise each axis of configurability.
404 #
405 configs = [
406     # A common LUKS default
407     LUKSConfig("aes-256-xts-plain64-sha1",
408                "aes", 256, "xts", "plain64", None, "sha1"),
409
410
411     # LUKS default but diff ciphers
412     LUKSConfig("twofish-256-xts-plain64-sha1",
413                "twofish", 256, "xts", "plain64", None, "sha1"),
414     LUKSConfig("serpent-256-xts-plain64-sha1",
415                "serpent", 256, "xts", "plain64", None, "sha1"),
416     # Should really be xts, but kernel doesn't support xts+cast5
417     # nor does it do essiv+cast5
418     LUKSConfig("cast5-128-cbc-plain64-sha1",
419                "cast5", 128, "cbc", "plain64", None, "sha1"),
420     LUKSConfig("cast6-256-xts-plain64-sha1",
421                "cast6", 256, "xts", "plain64", None, "sha1"),
422
423
424     # LUKS default but diff modes / ivgens
425     LUKSConfig("aes-256-cbc-plain-sha1",
426                "aes", 256, "cbc", "plain", None, "sha1"),
427     LUKSConfig("aes-256-cbc-plain64-sha1",
428                "aes", 256, "cbc", "plain64", None, "sha1"),
429     LUKSConfig("aes-256-cbc-essiv-sha256-sha1",
430                "aes", 256, "cbc", "essiv", "sha256", "sha1"),
431     LUKSConfig("aes-256-xts-essiv-sha256-sha1",
432                "aes", 256, "xts", "essiv", "sha256", "sha1"),
433
434
435     # LUKS default but smaller key sizes
436     LUKSConfig("aes-128-xts-plain64-sha256-sha1",
437                "aes", 128, "xts", "plain64", None, "sha1"),
438     LUKSConfig("aes-192-xts-plain64-sha256-sha1",
439                "aes", 192, "xts", "plain64", None, "sha1"),
440
441     LUKSConfig("twofish-128-xts-plain64-sha1",
442                "twofish", 128, "xts", "plain64", None, "sha1"),
443     LUKSConfig("twofish-192-xts-plain64-sha1",
444                "twofish", 192, "xts", "plain64", None, "sha1"),
445
446     LUKSConfig("serpent-128-xts-plain64-sha1",
447                "serpent", 128, "xts", "plain64", None, "sha1"),
448     LUKSConfig("serpent-192-xts-plain64-sha1",
449                "serpent", 192, "xts", "plain64", None, "sha1"),
450
451     LUKSConfig("cast6-128-xts-plain64-sha1",
452                "cast6", 128, "xts", "plain", None, "sha1"),
453     LUKSConfig("cast6-192-xts-plain64-sha1",
454                "cast6", 192, "xts", "plain64", None, "sha1"),
455
456
457     # LUKS default but diff hash
458     LUKSConfig("aes-256-xts-plain64-sha224",
459                "aes", 256, "xts", "plain64", None, "sha224"),
460     LUKSConfig("aes-256-xts-plain64-sha256",
461                "aes", 256, "xts", "plain64", None, "sha256"),
462     LUKSConfig("aes-256-xts-plain64-sha384",
463                "aes", 256, "xts", "plain64", None, "sha384"),
464     LUKSConfig("aes-256-xts-plain64-sha512",
465                "aes", 256, "xts", "plain64", None, "sha512"),
466     LUKSConfig("aes-256-xts-plain64-ripemd160",
467                "aes", 256, "xts", "plain64", None, "ripemd160"),
468
469     # Password in slot 3
470     LUKSConfig("aes-256-xts-plain-sha1-pwslot3",
471                "aes", 256, "xts", "plain", None, "sha1",
472                passwords={
473                    "3": "slot3",
474                }),
475
476     # Passwords in every slot
477     LUKSConfig("aes-256-xts-plain-sha1-pwallslots",
478                "aes", 256, "xts", "plain", None, "sha1",
479                passwords={
480                    "0": "slot1",
481                    "1": "slot1",
482                    "2": "slot2",
483                    "3": "slot3",
484                    "4": "slot4",
485                    "5": "slot5",
486                    "6": "slot6",
487                    "7": "slot7",
488                }),
489
490     # Check handling of default hash alg (sha256) with essiv
491     LUKSConfig("aes-256-cbc-essiv-auto-sha1",
492                "aes", 256, "cbc", "essiv", None, "sha1"),
493
494     # Check that a useless hash provided for 'plain64' iv gen
495     # is ignored and no error raised
496     LUKSConfig("aes-256-cbc-plain64-sha256-sha1",
497                "aes", 256, "cbc", "plain64", "sha256", "sha1"),
498
499 ]
500
501 blacklist = [
502     # We don't have a cast-6 cipher impl for QEMU yet
503     "cast6-256-xts-plain64-sha1",
504     "cast6-128-xts-plain64-sha1",
505     "cast6-192-xts-plain64-sha1",
506
507     # GCrypt doesn't support Twofish with 192 bit key
508     "twofish-192-xts-plain64-sha1",
509 ]
510
511 whitelist = []
512 if "LUKS_CONFIG" in os.environ:
513     whitelist = os.environ["LUKS_CONFIG"].split(",")
514
515 for config in configs:
516     if config.name in blacklist:
517         iotests.log("Skipping %s in blacklist" % config.name)
518         continue
519
520     if len(whitelist) > 0 and config.name not in whitelist:
521         iotests.log("Skipping %s not in whitelist" % config.name)
522         continue
523
524     test_once(config, qemu_img=False)
525
526     # XXX we should support setting passwords in a non-0
527     # key slot with 'qemu-img create' in future
528     (pw, slot) = config.first_password()
529     if slot == "0":
530         test_once(config, qemu_img=True)
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