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     elif config.ivgen == "essiv":
 157         cipher = cipher + ":" + "sha256"
 158     args.extend(["--cipher", cipher])
 159     if config.mode == "xts":
 160         args.extend(["--key-size", str(config.keylen * 2)])
 161     else:
 162         args.extend(["--key-size", str(config.keylen)])
 163     if config.hash is not None:
 164         args.extend(["--hash", config.hash])
 165     args.extend(["--key-slot", slot])
 166     args.extend(["--key-file", "-"])
 167     args.append(config.image_path())
 168
 169     cryptsetup(args, password)
 170
 171
 172 def chown(config):
 173     """Set the ownership of a open LUKS device to this user"""
 174
 175     path = config.device_path()
 176
 177     args = ["sudo", "chown", "%d:%d" % (os.getuid(), os.getgid()), path]
 178     iotests.log(" ".join(args), filters=[iotests.filter_chown])
 179     proc = subprocess.Popen(args,
 180                             stdin=subprocess.PIPE,
 181                             stdout=subprocess.PIPE,
 182                             stderr=subprocess.STDOUT)
 183
 184     msg = proc.communicate()[0]
 185
 186     if proc.returncode != 0:
 187         raise Exception("Cannot change owner on %s" % path)
 188
 189
 190 def cryptsetup_open(config):
 191     """Open an image as a LUKS device"""
 192
 193     (password, slot) = config.first_password()
 194
 195     args = ["luksOpen", config.image_path(), config.device_name()]
 196
 197     cryptsetup(args, password)
 198
 199
 200 def cryptsetup_close(config):
 201     """Close an active LUKS device """
 202
 203     args = ["luksClose", config.device_name()]
 204     cryptsetup(args)
 205
 206
 207 def delete_image(config):
 208     """Delete a disk image"""
 209
 210     try:
 211         os.unlink(config.image_path())
 212         iotests.log("unlink %s" % config.image_path(),
 213                     filters=[iotests.filter_test_dir])
 214     except Exception as e:
 215         pass
 216
 217
 218 def create_image(config, size_mb):
 219     """Create a bare disk image with requested size"""
 220
 221     delete_image(config)
 222     iotests.log("truncate %s --size %dMB" % (config.image_path(), size_mb),
 223                 filters=[iotests.filter_test_dir])
 224     with open(config.image_path(), "w") as fn:
 225         fn.truncate(size_mb * 1024 * 1024)
 226
 227
 228 def qemu_img_create(config, size_mb):
 229     """Create and format a disk image with LUKS using qemu-img"""
 230
 231     opts = [
 232         "key-secret=sec0",
 233         "cipher-alg=%s-%d" % (config.cipher, config.keylen),
 234         "cipher-mode=%s" % config.mode,
 235         "ivgen-alg=%s" % config.ivgen,
 236         "hash-alg=%s" % config.hash,
 237     ]
 238     if config.ivgen_hash is not None:
 239         opts.append("ivgen-hash-alg=%s" % config.ivgen_hash)
 240
 241     args = ["create", "-f", "luks",
 242             "--object",
 243             ("secret,id=sec0,data=%s,format=base64" %
 244              config.first_password_base64()),
 245             "-o", ",".join(opts),
 246             config.image_path(),
 247             "%dM" % size_mb]
 248
 249     iotests.log("qemu-img " + " ".join(args), filters=[iotests.filter_test_dir])
 250     iotests.log(iotests.qemu_img_pipe(*args), filters=[iotests.filter_test_dir])
 251
 252 def qemu_io_image_args(config, dev=False):
 253     """Get the args for access an image or device with qemu-io"""
 254
 255     if dev:
 256         return [
 257             "--image-opts",
 258             "driver=file,filename=%s" % config.device_path()]
 259     else:
 260         return [
 261             "--object",
 262             ("secret,id=sec0,data=%s,format=base64" %
 263              config.first_password_base64()),
 264             "--image-opts",
 265             ("driver=luks,key-secret=sec0,file.filename=%s" %
 266              config.image_path())]
 267
 268 def qemu_io_write_pattern(config, pattern, offset_mb, size_mb, dev=False):
 269     """Write a pattern of data to a LUKS image or device"""
 270
 271     args = ["-c", "write -P 0x%x %dM %dM" % (pattern, offset_mb, size_mb)]
 272     args.extend(qemu_io_image_args(config, dev))
 273     iotests.log("qemu-io " + " ".join(args), filters=[iotests.filter_test_dir])
 274     iotests.log(iotests.qemu_io(*args), filters=[iotests.filter_test_dir,
 275                                                  iotests.filter_qemu_io])
 276
 277
 278 def qemu_io_read_pattern(config, pattern, offset_mb, size_mb, dev=False):
 279     """Read a pattern of data to a LUKS image or device"""
 280
 281     args = ["-c", "read -P 0x%x %dM %dM" % (pattern, offset_mb, size_mb)]
 282     args.extend(qemu_io_image_args(config, dev))
 283     iotests.log("qemu-io " + " ".join(args), filters=[iotests.filter_test_dir])
 284     iotests.log(iotests.qemu_io(*args), filters=[iotests.filter_test_dir,
 285                                                  iotests.filter_qemu_io])
 286
 287
 288 def test_once(config, qemu_img=False):
 289     """Run the test with a desired LUKS configuration. Can either
 290        use qemu-img for creating the initial volume, or cryptsetup,
 291        in order to test interoperability in both directions"""
 292
 293     iotests.log("# ================= %s %s =================" % (
 294         "qemu-img" if qemu_img else "dm-crypt", config))
 295
 296     oneKB = 1024
 297     oneMB = oneKB * 1024
 298     oneGB = oneMB * 1024
 299     oneTB = oneGB * 1024
 300
 301     # 4 TB, so that we pass the 32-bit sector number boundary.
 302     # Important for testing correctness of some IV generators
 303     # The files are sparse, so not actually using this much space
 304     image_size = 4 * oneTB
 305     if qemu_img:
 306         iotests.log("# Create image")
 307         qemu_img_create(config, image_size / oneMB)
 308     else:
 309         iotests.log("# Create image")
 310         create_image(config, image_size / oneMB)
 311
 312     lowOffsetMB = 100
 313     highOffsetMB = 3 * oneTB / oneMB
 314
 315     try:
 316         if not qemu_img:
 317             iotests.log("# Format image")
 318             cryptsetup_format(config)
 319
 320             for slot in config.active_slots()[1:]:
 321                 iotests.log("# Add password slot %s" % slot)
 322                 cryptsetup_add_password(config, slot)
 323
 324         # First we'll open the image using cryptsetup and write a
 325         # known pattern of data that we'll then verify with QEMU
 326
 327         iotests.log("# Open dev")
 328         cryptsetup_open(config)
 329
 330         try:
 331             iotests.log("# Set dev owner")
 332             chown(config)
 333
 334             iotests.log("# Write test pattern 0xa7")
 335             qemu_io_write_pattern(config, 0xa7, lowOffsetMB, 10, dev=True)
 336             iotests.log("# Write test pattern 0x13")
 337             qemu_io_write_pattern(config, 0x13, highOffsetMB, 10, dev=True)
 338         finally:
 339             iotests.log("# Close dev")
 340             cryptsetup_close(config)
 341
 342         # Ok, now we're using QEMU to verify the pattern just
 343         # written via dm-crypt
 344
 345         iotests.log("# Read test pattern 0xa7")
 346         qemu_io_read_pattern(config, 0xa7, lowOffsetMB, 10, dev=False)
 347         iotests.log("# Read test pattern 0x13")
 348         qemu_io_read_pattern(config, 0x13, highOffsetMB, 10, dev=False)
 349
 350
 351         # Write a new pattern to the image, which we'll later
 352         # verify with dm-crypt
 353         iotests.log("# Write test pattern 0x91")
 354         qemu_io_write_pattern(config, 0x91, lowOffsetMB, 10, dev=False)
 355         iotests.log("# Write test pattern 0x5e")
 356         qemu_io_write_pattern(config, 0x5e, highOffsetMB, 10, dev=False)
 357
 358
 359         # Now we're opening the image with dm-crypt once more
 360         # and verifying what QEMU wrote, completing the circle
 361         iotests.log("# Open dev")
 362         cryptsetup_open(config)
 363
 364         try:
 365             iotests.log("# Set dev owner")
 366             chown(config)
 367
 368             iotests.log("# Read test pattern 0x91")
 369             qemu_io_read_pattern(config, 0x91, lowOffsetMB, 10, dev=True)
 370             iotests.log("# Read test pattern 0x5e")
 371             qemu_io_read_pattern(config, 0x5e, highOffsetMB, 10, dev=True)
 372         finally:
 373             iotests.log("# Close dev")
 374             cryptsetup_close(config)
 375     finally:
 376         iotests.log("# Delete image")
 377         delete_image(config)
 378         print
 379
 380
 381 # Obviously we only work with the luks image format
 382 iotests.verify_image_format(supported_fmts=['luks'])
 383 iotests.verify_platform()
 384
 385 # We need sudo in order to run cryptsetup to create
 386 # dm-crypt devices. This is safe to use on any
 387 # machine, since all dm-crypt devices are backed
 388 # by newly created plain files, and have a dm-crypt
 389 # name prefix of 'qiotest' to avoid clashing with
 390 # user LUKS volumes
 391 verify_passwordless_sudo()
 392
 393
 394 # If we look at all permutations of cipher, key size,
 395 # mode, ivgen, hash, there are ~1000 possible configs.
 396 #
 397 # We certainly don't want/need to test every permutation
 398 # to get good validation of interoperability between QEMU
 399 # and dm-crypt/cryptsetup.
 400 #
 401 # The configs below are a representative set that aim to
 402 # exercise each axis of configurability.
 403 #
 404 configs = [
 405     # A common LUKS default
 406     LUKSConfig("aes-256-xts-plain64-sha1",
 407                "aes", 256, "xts", "plain64", None, "sha1"),
 408
 409
 410     # LUKS default but diff ciphers
 411     LUKSConfig("twofish-256-xts-plain64-sha1",
 412                "twofish", 256, "xts", "plain64", None, "sha1"),
 413     LUKSConfig("serpent-256-xts-plain64-sha1",
 414                "serpent", 256, "xts", "plain64", None, "sha1"),
 415     # Should really be xts, but kernel doesn't support xts+cast5
 416     # nor does it do essiv+cast5
 417     LUKSConfig("cast5-128-cbc-plain64-sha1",
 418                "cast5", 128, "cbc", "plain64", None, "sha1"),
 419     LUKSConfig("cast6-256-xts-plain64-sha1",
 420                "cast6", 256, "xts", "plain64", None, "sha1"),
 421
 422
 423     # LUKS default but diff modes / ivgens
 424     LUKSConfig("aes-256-cbc-plain-sha1",
 425                "aes", 256, "cbc", "plain", None, "sha1"),
 426     LUKSConfig("aes-256-cbc-plain64-sha1",
 427                "aes", 256, "cbc", "plain64", None, "sha1"),
 428     LUKSConfig("aes-256-cbc-essiv-sha256-sha1",
 429                "aes", 256, "cbc", "essiv", "sha256", "sha1"),
 430     LUKSConfig("aes-256-xts-essiv-sha256-sha1",
 431                "aes", 256, "xts", "essiv", "sha256", "sha1"),
 432
 433
 434     # LUKS default but smaller key sizes
 435     LUKSConfig("aes-128-xts-plain64-sha256-sha1",
 436                "aes", 128, "xts", "plain64", None, "sha1"),
 437     LUKSConfig("aes-192-xts-plain64-sha256-sha1",
 438                "aes", 192, "xts", "plain64", None, "sha1"),
 439
 440     LUKSConfig("twofish-128-xts-plain64-sha1",
 441                "twofish", 128, "xts", "plain64", None, "sha1"),
 442     LUKSConfig("twofish-192-xts-plain64-sha1",
 443                "twofish", 192, "xts", "plain64", None, "sha1"),
 444
 445     LUKSConfig("serpent-128-xts-plain64-sha1",
 446                "serpent", 128, "xts", "plain64", None, "sha1"),
 447     LUKSConfig("serpent-192-xts-plain64-sha1",
 448                "serpent", 192, "xts", "plain64", None, "sha1"),
 449
 450     LUKSConfig("cast6-128-xts-plain64-sha1",
 451                "cast6", 128, "xts", "plain", None, "sha1"),
 452     LUKSConfig("cast6-192-xts-plain64-sha1",
 453                "cast6", 192, "xts", "plain64", None, "sha1"),
 454
 455
 456     # LUKS default but diff hash
 457     LUKSConfig("aes-256-xts-plain64-sha256",
 458                "aes", 256, "xts", "plain64", None, "sha256"),
 459     LUKSConfig("aes-256-xts-plain64-sha512",
 460                "aes", 256, "xts", "plain64", None, "sha512"),
 461     LUKSConfig("aes-256-xts-plain64-ripemd160",
 462                "aes", 256, "xts", "plain64", None, "ripemd160"),
 463
 464     # Password in slot 3
 465     LUKSConfig("aes-256-xts-plain-sha1-pwslot3",
 466                "aes", 256, "xts", "plain", None, "sha1",
 467                passwords={
 468                    "3": "slot3",
 469                }),
 470
 471     # Passwords in every slot
 472     LUKSConfig("aes-256-xts-plain-sha1-pwallslots",
 473                "aes", 256, "xts", "plain", None, "sha1",
 474                passwords={
 475                    "0": "slot1",
 476                    "1": "slot1",
 477                    "2": "slot2",
 478                    "3": "slot3",
 479                    "4": "slot4",
 480                    "5": "slot5",
 481                    "6": "slot6",
 482                    "7": "slot7",
 483                }),
 484
 485     # Check handling of default hash alg (sha256) with essiv
 486     LUKSConfig("aes-256-cbc-essiv-auto-sha1",
 487                "aes", 256, "cbc", "essiv", None, "sha1"),
 488
 489     # Check that a useless hash provided for 'plain64' iv gen
 490     # is ignored and no error raised
 491     LUKSConfig("aes-256-cbc-plain64-sha256-sha1",
 492                "aes", 256, "cbc", "plain64", "sha256", "sha1"),
 493
 494 ]
 495
 496 blacklist = [
 497     # We don't have a cast-6 cipher impl for QEMU yet
 498     "cast6-256-xts-plain64-sha1",
 499     "cast6-128-xts-plain64-sha1",
 500     "cast6-192-xts-plain64-sha1",
 501
 502     # GCrypt doesn't support Twofish with 192 bit key
 503     "twofish-192-xts-plain64-sha1",
 504
 505     # We don't have sha512 hash wired up yet
 506     "aes-256-xts-plain64-sha512",
 507
 508     # We don't have ripemd160 hash wired up yet
 509     "aes-256-xts-plain64-ripemd160",
 510 ]
 511
 512 whitelist = []
 513 if "LUKS_CONFIG" in os.environ:
 514     whitelist = os.environ["LUKS_CONFIG"].split(",")
 515
 516 for config in configs:
 517     if config.name in blacklist:
 518         iotests.log("Skipping %s in blacklist" % config.name)
 519         continue
 520
 521     if len(whitelist) > 0 and config.name not in whitelist:
 522         iotests.log("Skipping %s not in whitelist" % config.name)
 523         continue
 524
 525     test_once(config, qemu_img=False)
 526
 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()
 530     if slot == "0":
 531         test_once(config, qemu_img=True)