/usr/lib/python2.7/dist-packages/openid/store/filestore.py is in python-openid 2.2.5-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 | """
This module contains an C{L{OpenIDStore}} implementation backed by
flat files.
"""
import string
import os
import os.path
import time
from errno import EEXIST, ENOENT
try:
from tempfile import mkstemp
except ImportError:
# Python < 2.3
import warnings
warnings.filterwarnings("ignore",
"tempnam is a potential security risk",
RuntimeWarning,
"openid.store.filestore")
def mkstemp(dir):
for _ in range(5):
name = os.tempnam(dir)
try:
fd = os.open(name, os.O_CREAT | os.O_EXCL | os.O_RDWR, 0600)
except OSError, why:
if why.errno != EEXIST:
raise
else:
return fd, name
raise RuntimeError('Failed to get temp file after 5 attempts')
from openid.association import Association
from openid.store.interface import OpenIDStore
from openid.store import nonce
from openid import cryptutil, oidutil
_filename_allowed = string.ascii_letters + string.digits + '.'
try:
# 2.4
set
except NameError:
try:
# 2.3
import sets
except ImportError:
# Python < 2.2
d = {}
for c in _filename_allowed:
d[c] = None
_isFilenameSafe = d.has_key
del d
else:
_isFilenameSafe = sets.Set(_filename_allowed).__contains__
else:
_isFilenameSafe = set(_filename_allowed).__contains__
def _safe64(s):
h64 = oidutil.toBase64(cryptutil.sha1(s))
h64 = h64.replace('+', '_')
h64 = h64.replace('/', '.')
h64 = h64.replace('=', '')
return h64
def _filenameEscape(s):
filename_chunks = []
for c in s:
if _isFilenameSafe(c):
filename_chunks.append(c)
else:
filename_chunks.append('_%02X' % ord(c))
return ''.join(filename_chunks)
def _removeIfPresent(filename):
"""Attempt to remove a file, returning whether the file existed at
the time of the call.
str -> bool
"""
try:
os.unlink(filename)
except OSError, why:
if why.errno == ENOENT:
# Someone beat us to it, but it's gone, so that's OK
return 0
else:
raise
else:
# File was present
return 1
def _ensureDir(dir_name):
"""Create dir_name as a directory if it does not exist. If it
exists, make sure that it is, in fact, a directory.
Can raise OSError
str -> NoneType
"""
try:
os.makedirs(dir_name)
except OSError, why:
if why.errno != EEXIST or not os.path.isdir(dir_name):
raise
class FileOpenIDStore(OpenIDStore):
"""
This is a filesystem-based store for OpenID associations and
nonces. This store should be safe for use in concurrent systems
on both windows and unix (excluding NFS filesystems). There are a
couple race conditions in the system, but those failure cases have
been set up in such a way that the worst-case behavior is someone
having to try to log in a second time.
Most of the methods of this class are implementation details.
People wishing to just use this store need only pay attention to
the C{L{__init__}} method.
Methods of this object can raise OSError if unexpected filesystem
conditions, such as bad permissions or missing directories, occur.
"""
def __init__(self, directory):
"""
Initializes a new FileOpenIDStore. This initializes the
nonce and association directories, which are subdirectories of
the directory passed in.
@param directory: This is the directory to put the store
directories in.
@type directory: C{str}
"""
# Make absolute
directory = os.path.normpath(os.path.abspath(directory))
self.nonce_dir = os.path.join(directory, 'nonces')
self.association_dir = os.path.join(directory, 'associations')
# Temp dir must be on the same filesystem as the assciations
# directory
self.temp_dir = os.path.join(directory, 'temp')
self.max_nonce_age = 6 * 60 * 60 # Six hours, in seconds
self._setup()
def _setup(self):
"""Make sure that the directories in which we store our data
exist.
() -> NoneType
"""
_ensureDir(self.nonce_dir)
_ensureDir(self.association_dir)
_ensureDir(self.temp_dir)
def _mktemp(self):
"""Create a temporary file on the same filesystem as
self.association_dir.
The temporary directory should not be cleaned if there are any
processes using the store. If there is no active process using
the store, it is safe to remove all of the files in the
temporary directory.
() -> (file, str)
"""
fd, name = mkstemp(dir=self.temp_dir)
try:
file_obj = os.fdopen(fd, 'wb')
return file_obj, name
except:
_removeIfPresent(name)
raise
def getAssociationFilename(self, server_url, handle):
"""Create a unique filename for a given server url and
handle. This implementation does not assume anything about the
format of the handle. The filename that is returned will
contain the domain name from the server URL for ease of human
inspection of the data directory.
(str, str) -> str
"""
if server_url.find('://') == -1:
raise ValueError('Bad server URL: %r' % server_url)
proto, rest = server_url.split('://', 1)
domain = _filenameEscape(rest.split('/', 1)[0])
url_hash = _safe64(server_url)
if handle:
handle_hash = _safe64(handle)
else:
handle_hash = ''
filename = '%s-%s-%s-%s' % (proto, domain, url_hash, handle_hash)
return os.path.join(self.association_dir, filename)
def storeAssociation(self, server_url, association):
"""Store an association in the association directory.
(str, Association) -> NoneType
"""
association_s = association.serialize()
filename = self.getAssociationFilename(server_url, association.handle)
tmp_file, tmp = self._mktemp()
try:
try:
tmp_file.write(association_s)
os.fsync(tmp_file.fileno())
finally:
tmp_file.close()
try:
os.rename(tmp, filename)
except OSError, why:
if why.errno != EEXIST:
raise
# We only expect EEXIST to happen only on Windows. It's
# possible that we will succeed in unlinking the existing
# file, but not in putting the temporary file in place.
try:
os.unlink(filename)
except OSError, why:
if why.errno == ENOENT:
pass
else:
raise
# Now the target should not exist. Try renaming again,
# giving up if it fails.
os.rename(tmp, filename)
except:
# If there was an error, don't leave the temporary file
# around.
_removeIfPresent(tmp)
raise
def getAssociation(self, server_url, handle=None):
"""Retrieve an association. If no handle is specified, return
the association with the latest expiration.
(str, str or NoneType) -> Association or NoneType
"""
if handle is None:
handle = ''
# The filename with the empty handle is a prefix of all other
# associations for the given server URL.
filename = self.getAssociationFilename(server_url, handle)
if handle:
return self._getAssociation(filename)
else:
association_files = os.listdir(self.association_dir)
matching_files = []
# strip off the path to do the comparison
name = os.path.basename(filename)
for association_file in association_files:
if association_file.startswith(name):
matching_files.append(association_file)
matching_associations = []
# read the matching files and sort by time issued
for name in matching_files:
full_name = os.path.join(self.association_dir, name)
association = self._getAssociation(full_name)
if association is not None:
matching_associations.append(
(association.issued, association))
matching_associations.sort()
# return the most recently issued one.
if matching_associations:
(_, assoc) = matching_associations[-1]
return assoc
else:
return None
def _getAssociation(self, filename):
try:
assoc_file = file(filename, 'rb')
except IOError, why:
if why.errno == ENOENT:
# No association exists for that URL and handle
return None
else:
raise
else:
try:
assoc_s = assoc_file.read()
finally:
assoc_file.close()
try:
association = Association.deserialize(assoc_s)
except ValueError:
_removeIfPresent(filename)
return None
# Clean up expired associations
if association.getExpiresIn() == 0:
_removeIfPresent(filename)
return None
else:
return association
def removeAssociation(self, server_url, handle):
"""Remove an association if it exists. Do nothing if it does not.
(str, str) -> bool
"""
assoc = self.getAssociation(server_url, handle)
if assoc is None:
return 0
else:
filename = self.getAssociationFilename(server_url, handle)
return _removeIfPresent(filename)
def useNonce(self, server_url, timestamp, salt):
"""Return whether this nonce is valid.
str -> bool
"""
if abs(timestamp - time.time()) > nonce.SKEW:
return False
if server_url:
proto, rest = server_url.split('://', 1)
else:
# Create empty proto / rest values for empty server_url,
# which is part of a consumer-generated nonce.
proto, rest = '', ''
domain = _filenameEscape(rest.split('/', 1)[0])
url_hash = _safe64(server_url)
salt_hash = _safe64(salt)
filename = '%08x-%s-%s-%s-%s' % (timestamp, proto, domain,
url_hash, salt_hash)
filename = os.path.join(self.nonce_dir, filename)
try:
fd = os.open(filename, os.O_CREAT | os.O_EXCL | os.O_WRONLY, 0200)
except OSError, why:
if why.errno == EEXIST:
return False
else:
raise
else:
os.close(fd)
return True
def _allAssocs(self):
all_associations = []
association_filenames = map(
lambda filename: os.path.join(self.association_dir, filename),
os.listdir(self.association_dir))
for association_filename in association_filenames:
try:
association_file = file(association_filename, 'rb')
except IOError, why:
if why.errno == ENOENT:
oidutil.log("%s disappeared during %s._allAssocs" % (
association_filename, self.__class__.__name__))
else:
raise
else:
try:
assoc_s = association_file.read()
finally:
association_file.close()
# Remove expired or corrupted associations
try:
association = Association.deserialize(assoc_s)
except ValueError:
_removeIfPresent(association_filename)
else:
all_associations.append(
(association_filename, association))
return all_associations
def cleanup(self):
"""Remove expired entries from the database. This is
potentially expensive, so only run when it is acceptable to
take time.
() -> NoneType
"""
self.cleanupAssociations()
self.cleanupNonces()
def cleanupAssociations(self):
removed = 0
for assoc_filename, assoc in self._allAssocs():
if assoc.getExpiresIn() == 0:
_removeIfPresent(assoc_filename)
removed += 1
return removed
def cleanupNonces(self):
nonces = os.listdir(self.nonce_dir)
now = time.time()
removed = 0
# Check all nonces for expiry
for nonce_fname in nonces:
timestamp = nonce_fname.split('-', 1)[0]
timestamp = int(timestamp, 16)
if abs(timestamp - now) > nonce.SKEW:
filename = os.path.join(self.nonce_dir, nonce_fname)
_removeIfPresent(filename)
removed += 1
return removed
|