tests/qemu-iotests/149

   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 <berrange@redhat.com>
  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)