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 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                 pwfile]
 140
 141         cryptsetup(args, password)
 142     finally:
 143         os.unlink(pwfile)
 144
 145
 146 def cryptsetup_format(config):
 147     """Format a new LUKS volume with cryptsetup, adding the
 148     first key slot only"""
 149
 150     (password, slot) = config.first_password()
 151
 152     args = ["luksFormat"]
 153     cipher = config.cipher + "-" + config.mode + "-" + config.ivgen
 154     if config.ivgen_hash is not None:
 155         cipher = cipher + ":" + config.ivgen_hash
 156     args.extend(["--cipher", cipher])
 157     if config.mode == "xts":
 158         args.extend(["--key-size", str(config.keylen * 2)])
 159     else:
 160         args.extend(["--key-size", str(config.keylen)])
 161     if config.hash is not None:
 162         args.extend(["--hash", config.hash])
 163     args.extend(["--key-slot", slot])
 164     args.extend(["--key-file", "-"])
 165     args.append(config.image_path())
 166
 167     cryptsetup(args, password)
 168
 169
 170 def chown(config):
 171     """Set the ownership of a open LUKS device to this user"""
 172
 173     path = config.device_path()
 174
 175     args = ["sudo", "chown", "%d:%d" % (os.getuid(), os.getgid()), path]
 176     iotests.log(" ".join(args), filters=[iotests.filter_chown])
 177     proc = subprocess.Popen(args,
 178                             stdin=subprocess.PIPE,
 179                             stdout=subprocess.PIPE,
 180                             stderr=subprocess.STDOUT)
 181
 182     msg = proc.communicate()[0]
 183
 184     if proc.returncode != 0:
 185         raise Exception("Cannot change owner on %s" % path)
 186
 187
 188 def cryptsetup_open(config):
 189     """Open an image as a LUKS device"""
 190
 191     (password, slot) = config.first_password()
 192
 193     args = ["luksOpen", config.image_path(), config.device_name()]
 194
 195     cryptsetup(args, password)
 196
 197
 198 def cryptsetup_close(config):
 199     """Close an active LUKS device """
 200
 201     args = ["luksClose", config.device_name()]
 202     cryptsetup(args)
 203
 204
 205 def delete_image(config):
 206     """Delete a disk image"""
 207
 208     try:
 209         os.unlink(config.image_path())
 210         iotests.log("unlink %s" % config.image_path(),
 211                     filters=[iotests.filter_test_dir])
 212     except Exception as e:
 213         pass
 214
 215
 216 def create_image(config, size_mb):
 217     """Create a bare disk image with requested size"""
 218
 219     delete_image(config)
 220     iotests.log("truncate %s --size %dMB" % (config.image_path(), size_mb),
 221                 filters=[iotests.filter_test_dir])
 222     with open(config.image_path(), "w") as fn:
 223         fn.truncate(size_mb * 1024 * 1024)
 224
 225
 226 def qemu_img_create(config, size_mb):
 227     """Create and format a disk image with LUKS using qemu-img"""
 228
 229     opts = [
 230         "key-secret=sec0",
 231         "cipher-alg=%s-%d" % (config.cipher, config.keylen),
 232         "cipher-mode=%s" % config.mode,
 233         "ivgen-alg=%s" % config.ivgen,
 234         "hash-alg=%s" % config.hash,
 235     ]
 236     if config.ivgen_hash is not None:
 237         opts.append("ivgen-hash-alg=%s" % config.ivgen_hash)
 238
 239     args = ["create", "-f", "luks",
 240             "--object",
 241             ("secret,id=sec0,data=%s,format=base64" %
 242              config.first_password_base64()),
 243             "-o", ",".join(opts),
 244             config.image_path(),
 245             "%dM" % size_mb]
 246
 247     iotests.log("qemu-img " + " ".join(args), filters=[iotests.filter_test_dir])
 248     iotests.log(iotests.qemu_img_pipe(*args), filters=[iotests.filter_test_dir])
 249
 250 def qemu_io_image_args(config, dev=False):
 251     """Get the args for access an image or device with qemu-io"""
 252
 253     if dev:
 254         return [
 255             "--image-opts",
 256             "driver=file,filename=%s" % config.device_path()]
 257     else:
 258         return [
 259             "--object",
 260             ("secret,id=sec0,data=%s,format=base64" %
 261              config.first_password_base64()),
 262             "--image-opts",
 263             ("driver=luks,key-secret=sec0,file.filename=%s" %
 264              config.image_path())]
 265
 266 def qemu_io_write_pattern(config, pattern, offset_mb, size_mb, dev=False):
 267     """Write a pattern of data to a LUKS image or device"""
 268
 269     args = ["-c", "write -P 0x%x %dM %dM" % (pattern, offset_mb, size_mb)]
 270     args.extend(qemu_io_image_args(config, dev))
 271     iotests.log("qemu-io " + " ".join(args), filters=[iotests.filter_test_dir])
 272     iotests.log(iotests.qemu_io(*args), filters=[iotests.filter_test_dir,
 273                                                  iotests.filter_qemu_io])
 274
 275
 276 def qemu_io_read_pattern(config, pattern, offset_mb, size_mb, dev=False):
 277     """Read a pattern of data to a LUKS image or device"""
 278
 279     args = ["-c", "read -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 test_once(config, qemu_img=False):
 287     """Run the test with a desired LUKS configuration. Can either
 288        use qemu-img for creating the initial volume, or cryptsetup,
 289        in order to test interoperability in both directions"""
 290
 291     iotests.log("# ================= %s %s =================" % (
 292         "qemu-img" if qemu_img else "dm-crypt", config))
 293
 294     oneKB = 1024
 295     oneMB = oneKB * 1024
 296     oneGB = oneMB * 1024
 297     oneTB = oneGB * 1024
 298
 299     # 4 TB, so that we pass the 32-bit sector number boundary.
 300     # Important for testing correctness of some IV generators
 301     # The files are sparse, so not actually using this much space
 302     image_size = 4 * oneTB
 303     if qemu_img:
 304         iotests.log("# Create image")
 305         qemu_img_create(config, image_size / oneMB)
 306     else:
 307         iotests.log("# Create image")
 308         create_image(config, image_size / oneMB)
 309
 310     lowOffsetMB = 100
 311     highOffsetMB = 3 * oneTB / oneMB
 312
 313     try:
 314         if not qemu_img:
 315             iotests.log("# Format image")
 316             cryptsetup_format(config)
 317
 318             for slot in config.active_slots()[1:]:
 319                 iotests.log("# Add password slot %s" % slot)
 320                 cryptsetup_add_password(config, slot)
 321
 322         # First we'll open the image using cryptsetup and write a
 323         # known pattern of data that we'll then verify with QEMU
 324
 325         iotests.log("# Open dev")
 326         cryptsetup_open(config)
 327
 328         try:
 329             iotests.log("# Set dev owner")
 330             chown(config)
 331
 332             iotests.log("# Write test pattern 0xa7")
 333             qemu_io_write_pattern(config, 0xa7, lowOffsetMB, 10, dev=True)
 334             iotests.log("# Write test pattern 0x13")
 335             qemu_io_write_pattern(config, 0x13, highOffsetMB, 10, dev=True)
 336         finally:
 337             iotests.log("# Close dev")
 338             cryptsetup_close(config)
 339
 340         # Ok, now we're using QEMU to verify the pattern just
 341         # written via dm-crypt
 342
 343         iotests.log("# Read test pattern 0xa7")
 344         qemu_io_read_pattern(config, 0xa7, lowOffsetMB, 10, dev=False)
 345         iotests.log("# Read test pattern 0x13")
 346         qemu_io_read_pattern(config, 0x13, highOffsetMB, 10, dev=False)
 347
 348
 349         # Write a new pattern to the image, which we'll later
 350         # verify with dm-crypt
 351         iotests.log("# Write test pattern 0x91")
 352         qemu_io_write_pattern(config, 0x91, lowOffsetMB, 10, dev=False)
 353         iotests.log("# Write test pattern 0x5e")
 354         qemu_io_write_pattern(config, 0x5e, highOffsetMB, 10, dev=False)
 355
 356
 357         # Now we're opening the image with dm-crypt once more
 358         # and verifying what QEMU wrote, completing the circle
 359         iotests.log("# Open dev")
 360         cryptsetup_open(config)
 361
 362         try:
 363             iotests.log("# Set dev owner")
 364             chown(config)
 365
 366             iotests.log("# Read test pattern 0x91")
 367             qemu_io_read_pattern(config, 0x91, lowOffsetMB, 10, dev=True)
 368             iotests.log("# Read test pattern 0x5e")
 369             qemu_io_read_pattern(config, 0x5e, highOffsetMB, 10, dev=True)
 370         finally:
 371             iotests.log("# Close dev")
 372             cryptsetup_close(config)
 373     finally:
 374         iotests.log("# Delete image")
 375         delete_image(config)
 376         print
 377
 378
 379 # Obviously we only work with the luks image format
 380 iotests.verify_image_format(supported_fmts=['luks'])
 381 iotests.verify_platform()
 382
 383 # We need sudo in order to run cryptsetup to create
 384 # dm-crypt devices. This is safe to use on any
 385 # machine, since all dm-crypt devices are backed
 386 # by newly created plain files, and have a dm-crypt
 387 # name prefix of 'qiotest' to avoid clashing with
 388 # user LUKS volumes
 389 verify_passwordless_sudo()
 390
 391
 392 # If we look at all permutations of cipher, key size,
 393 # mode, ivgen, hash, there are ~1000 possible configs.
 394 #
 395 # We certainly don't want/need to test every permutation
 396 # to get good validation of interoperability between QEMU
 397 # and dm-crypt/cryptsetup.
 398 #
 399 # The configs below are a representative set that aim to
 400 # exercise each axis of configurability.
 401 #
 402 configs = [
 403     # A common LUKS default
 404     LUKSConfig("aes-256-xts-plain64-sha1",
 405                "aes", 256, "xts", "plain64", None, "sha1"),
 406
 407
 408     # LUKS default but diff ciphers
 409     LUKSConfig("twofish-256-xts-plain64-sha1",
 410                "twofish", 256, "xts", "plain64", None, "sha1"),
 411     LUKSConfig("serpent-256-xts-plain64-sha1",
 412                "serpent", 256, "xts", "plain64", None, "sha1"),
 413     # Should really be xts, but kernel doesn't support xts+cast5
 414     # nor does it do essiv+cast5
 415     LUKSConfig("cast5-128-cbc-plain64-sha1",
 416                "cast5", 128, "cbc", "plain64", None, "sha1"),
 417     LUKSConfig("cast6-256-xts-plain64-sha1",
 418                "cast6", 256, "xts", "plain64", None, "sha1"),
 419
 420
 421     # LUKS default but diff modes / ivgens
 422     LUKSConfig("aes-256-cbc-plain-sha1",
 423                "aes", 256, "cbc", "plain", None, "sha1"),
 424     LUKSConfig("aes-256-cbc-plain64-sha1",
 425                "aes", 256, "cbc", "plain64", None, "sha1"),
 426     LUKSConfig("aes-256-cbc-essiv-sha256-sha1",
 427                "aes", 256, "cbc", "essiv", "sha256", "sha1"),
 428     LUKSConfig("aes-256-xts-essiv-sha256-sha1",
 429                "aes", 256, "xts", "essiv", "sha256", "sha1"),
 430
 431
 432     # LUKS default but smaller key sizes
 433     LUKSConfig("aes-128-xts-plain64-sha256-sha1",
 434                "aes", 128, "xts", "plain64", None, "sha1"),
 435     LUKSConfig("aes-192-xts-plain64-sha256-sha1",
 436                "aes", 192, "xts", "plain64", None, "sha1"),
 437
 438     LUKSConfig("twofish-128-xts-plain64-sha1",
 439                "twofish", 128, "xts", "plain64", None, "sha1"),
 440     LUKSConfig("twofish-192-xts-plain64-sha1",
 441                "twofish", 192, "xts", "plain64", None, "sha1"),
 442
 443     LUKSConfig("serpent-128-xts-plain64-sha1",
 444                "serpent", 128, "xts", "plain64", None, "sha1"),
 445     LUKSConfig("serpent-192-xts-plain64-sha1",
 446                "serpent", 192, "xts", "plain64", None, "sha1"),
 447
 448     LUKSConfig("cast6-128-xts-plain64-sha1",
 449                "cast6", 128, "xts", "plain", None, "sha1"),
 450     LUKSConfig("cast6-192-xts-plain64-sha1",
 451                "cast6", 192, "xts", "plain64", None, "sha1"),
 452
 453
 454     # LUKS default but diff hash
 455     LUKSConfig("aes-256-xts-plain64-sha256",
 456                "aes", 256, "xts", "plain64", None, "sha256"),
 457     LUKSConfig("aes-256-xts-plain64-sha512",
 458                "aes", 256, "xts", "plain64", None, "sha512"),
 459     LUKSConfig("aes-256-xts-plain64-ripemd160",
 460                "aes", 256, "xts", "plain64", None, "ripemd160"),
 461
 462     # Password in slot 3
 463     LUKSConfig("aes-256-xts-plain-sha1-pwslot3",
 464                "aes", 256, "xts", "plain", None, "sha1",
 465                passwords={
 466                    "3": "slot3",
 467                }),
 468
 469     # Passwords in every slot
 470     LUKSConfig("aes-256-xts-plain-sha1-pwallslots",
 471                "aes", 256, "xts", "plain", None, "sha1",
 472                passwords={
 473                    "0": "slot1",
 474                    "1": "slot1",
 475                    "2": "slot2",
 476                    "3": "slot3",
 477                    "4": "slot4",
 478                    "5": "slot5",
 479                    "6": "slot6",
 480                    "7": "slot7",
 481                }),
 482 ]
 483
 484 blacklist = [
 485     # We don't have a cast-6 cipher impl for QEMU yet
 486     "cast6-256-xts-plain64-sha1",
 487     "cast6-128-xts-plain64-sha1",
 488     "cast6-192-xts-plain64-sha1",
 489
 490     # GCrypt doesn't support Twofish with 192 bit key
 491     "twofish-192-xts-plain64-sha1",
 492
 493     # We don't have sha512 hash wired up yet
 494     "aes-256-xts-plain64-sha512",
 495
 496     # We don't have ripemd160 hash wired up yet
 497     "aes-256-xts-plain64-ripemd160",
 498 ]
 499
 500 whitelist = []
 501 if "LUKS_CONFIG" in os.environ:
 502     whitelist = os.environ["LUKS_CONFIG"].split(",")
 503
 504 for config in configs:
 505     if config.name in blacklist:
 506         iotests.log("Skipping %s in blacklist" % config.name)
 507         continue
 508
 509     if len(whitelist) > 0 and config.name not in whitelist:
 510         iotests.log("Skipping %s not in whitelist" % config.name)
 511         continue
 512
 513     test_once(config, qemu_img=False)
 514
 515     # XXX we should support setting passwords in a non-0
 516     # key slot with 'qemu-img create' in future
 517     (pw, slot) = config.first_password()
 518     if slot == "0":
 519         test_once(config, qemu_img=True)