x/swiftonfile
Code Issues Proposed changes

Fix bug in object name constraint

Browse Source 
SOF can support object names of upto 1024 if it conforms to the
following constraints:

Object names can have forward slashes ('/') in them. Each segment in
between these slashes cannot exceed 255 characters with exception of
the last segment which cannot exceed 221 characters.

This constraint arises from the fact that each segment except the last
one in object name is a directory, the last segment being an actual
file on the filesystem.

Also, restored default constraint values in swift.conf since the SOF
constraints middleware (always in proxy pipeline) will take care of it.

Change-Id: Ia7dc44671a87911c092fecd0344eace92f5c225b
Signed-off-by: Prashanth Pai <ppai@redhat.com>
This commit is contained in:
Prashanth Pai 2014-10-09 00:00:34 +05:30
parent e87f634b0f
commit b4ee36ef11
9 changed files with 120 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
.functests
View File

@ -59,6 +59,15 @@ Before proceeding forward, please make sure you already have:
name = swiftonfile
default = yes
Added sof_constraints middleware in proxy pipeline
[pipeline:main]
pipeline = catch_errors sof_constraints cache proxy-server
[filter:sof_constraints]
use = egg:swiftonfile#sof_constraints
policies=swiftonfile
4. Copied etc/object-server.conf-swiftonfile to /etc/swift/object-server/5.conf
5. Generated ring files for swiftonfile policy.

16
etc/swift.conf-swiftonfile
View File

@ -107,7 +107,12 @@ name = swiftonfile
# max_object_name_length is the max number of bytes in the utf8 encoding
# of an object name
max_object_name_length = 221
# max_object_name_length = 221
# 221 is in fact the max possible length of the last segment of object name.
# Each segment is separated by a '/'.
# For example: If object name is "abc/def/ghi/jkl", then abc,def,ghi are all
# directories and "jkl" would be the file.
#
# Why 221 ?
# The longest filename supported by XFS in 255.
# http://lxr.free-electrons.com/source/fs/xfs/xfs_types.h#L125
@ -115,17 +120,18 @@ max_object_name_length = 221
# .OBJECT_NAME.<random-string>
# The random string is 32 character long and and file name has two dots.
# Hence 255 - 32 - 2 = 221
# NOTE: This limitation can be sefely raised by having slashes in really long
# object name. Each segment between slashes ('/') should not exceed 221.
#
# NOTE: Each segment between slashes ('/') should not exceed 255 and the last
# segment should not exceed 221.
# max_account_name_length is the max number of bytes in the utf8 encoding
# of an account name
max_account_name_length = 255
# max_account_name_length = 255
# max_container_name_length is the max number of bytes in the utf8 encoding
# of a container name
max_container_name_length = 255
# max_container_name_length = 255
# Why 255 ?
# The longest filename supported by XFS in 255.

34
swiftonfile/swift/common/constraints.py
View File

@ -16,8 +16,16 @@
import os
from swift.common.swob import HTTPBadRequest
SOF_MAX_CONTAINER_NAME_LENGTH = 255
SOF_MAX_OBJECT_NAME_LENGTH = 221
SOF_MAX_DIR_NAME_LENGTH = 255
# A container is also a directory on the fileystem with the same name. Hence:
SOF_MAX_CONTAINER_NAME_LENGTH = SOF_MAX_DIR_NAME_LENGTH
SOF_MAX_OBJECT_FILENAME_LENGTH = 221
# SOF_MAX_OBJECT_FILENAME_LENGTH is the length of the last segment of object
# name. Each 'segment/component' is separated by a '/'.
# For example: If object name is "abc/def/ghi/jkl", then abc,def,ghi are all
# directories and "jkl" would be the file. This file name cannot exceed
# SOF_MAX_OBJECT_FILENAME_LENGTH.
# Why 221 ?
# The longest filename supported by XFS in 255.
# http://lxr.free-electrons.com/source/fs/xfs/xfs_types.h#L125
@ -25,15 +33,19 @@ SOF_MAX_OBJECT_NAME_LENGTH = 221
# .OBJECT_NAME.<random-string>
# The random string is 32 character long and and file name has two dots.
# Hence 255 - 32 - 2 = 221
# NOTE: This limitation can be sefely raised by having slashes in really long
# object name. Each segment between slashes ('/') should not exceed 221.
# NOTE: Each segment between slashes ('/') should not exceed 255 and the last
# segment should not exceed 221.
def validate_obj_name_component(obj):
def validate_obj_name_component(obj, last_component=False):
if not obj:
return 'cannot begin, end, or have contiguous %s\'s' % os.path.sep
if len(obj) > SOF_MAX_OBJECT_NAME_LENGTH:
return 'too long (%d)' % len(obj)
if not last_component:
if len(obj) > SOF_MAX_DIR_NAME_LENGTH:
return 'too long (%d)' % len(obj)
else:
if len(obj) > SOF_MAX_OBJECT_FILENAME_LENGTH:
return 'too long (%d)' % len(obj)
if obj == '.' or obj == '..':
return 'cannot be . or ..'
return ''
@ -55,8 +67,12 @@ def check_object_creation(req, object_name):
"""
# SoF's additional checks
ret = None
for obj in object_name.split(os.path.sep):
reason = validate_obj_name_component(obj)
object_name_components = object_name.split(os.path.sep)
last_component = False
for i, obj in enumerate(object_name_components):
if i == (len(object_name_components) - 1):
last_component = True
reason = validate_obj_name_component(obj, last_component)
if reason:
bdy = 'Invalid object name "%s", component "%s" %s' \
% (object_name, obj, reason)

2
swiftonfile/swift/common/middleware/check_constraints.py
View File

@ -28,7 +28,7 @@ For example::
pipeline = catch_errors sof_constraints cache proxy-server
[filter:sof_constraints]
use = egg:swift#sof_constraints
use = egg:swiftonfile#sof_constraints
policies=swiftonfile,gold
"""

23
test/functional/swift_on_file_tests.py
View File

@ -127,7 +127,8 @@ class TestSwiftOnFile(Base):
file_item.write_random()
self.assert_status(201)
file_info = file_item.info()
fhOnMountPoint = open(os.path.join(self.env.root_dir,
fhOnMountPoint = open(os.path.join(
self.env.root_dir,
'AUTH_' + self.env.account.name,
self.env.container.name,
file_name), 'r')
@ -158,3 +159,23 @@ class TestSwiftOnFile(Base):
# Confirm that Etag is present in response headers
self.assert_(data_hash == object_item.info()['etag'])
self.assert_status(200)
def testObjectNameConstraints(self):
valid_object_names = ["a/b/c/d",
'/'.join(("1@3%&*0-", "};+=]|")),
'/'.join(('a' * 20, 'b' * 20, 'c' * 20))]
for object_name in valid_object_names:
file_item = self.env.container.file(object_name)
file_item.write_random()
self.assert_status(201)
invalid_object_names = ["a/./b",
"a/b/../d",
"a//b",
"a/c//",
'/'.join(('a' * 256, 'b' * 255, 'c' * 221)),
'/'.join(('a' * 255, 'b' * 255, 'c' * 222))]
for object_name in invalid_object_names:
file_item = self.env.container.file(object_name)
self.assertRaises(ResponseError, file_item.write) # 503 or 400

3
test/functional/test_account.py
View File

@ -741,6 +741,9 @@ class TestAccount(unittest.TestCase):
self.assertEqual(resp.getheader('x-account-meta-two'), '2')
def test_bad_metadata(self):
raise SkipTest('SOF constraints middleware enforces constraints.')
if tf.skip:
raise SkipTest

3
test/functional/test_container.py
View File

@ -368,6 +368,9 @@ class TestContainer(unittest.TestCase):
self.assertEqual(resp.status, 404)
def test_POST_bad_metadata(self):
raise SkipTest('SOF constraints middleware enforces constraints.')
if tf.skip:
raise SkipTest

6
test/functional/tests.py
View File

@ -351,6 +351,9 @@ class TestContainer(Base):
set_up = False
def testContainerNameLimit(self):
raise SkipTest('SOF constraints middleware enforces constraints.')
limit = load_constraint('max_container_name_length')
for l in (limit - 100, limit - 10, limit - 1, limit,
@ -971,6 +974,9 @@ class TestFile(Base):
self.assert_status(404)
def testNameLimit(self):
raise SkipTest('SOF constraints middleware enforces constraints.')
limit = load_constraint('max_object_name_length')
for l in (1, 10, limit / 2, limit - 1, limit, limit + 1, limit * 2):

50
test/unit/common/test_constraints.py
View File

@ -14,7 +14,7 @@
# limitations under the License.
import unittest
from mock import Mock, patch
from mock import Mock
from swiftonfile.swift.common import constraints as cnt
@ -26,16 +26,32 @@ class TestConstraints(unittest.TestCase):
""" Tests for common.constraints """
def test_validate_obj_name_component(self):
max_obj_len = cnt.SOF_MAX_OBJECT_NAME_LENGTH
self.assertFalse(
cnt.validate_obj_name_component('tests' * (max_obj_len / 5)))
self.assertEqual(cnt.validate_obj_name_component(
'tests' * 60), 'too long (300)')
# Non-last object name component - success
for i in (220, 221, 222, 254, 255):
obj_comp_name = 'a' * i
self.assertFalse(cnt.validate_obj_name_component(obj_comp_name))
# Last object name component - success
for i in (220, 221):
obj_comp_name = 'a' * i
self.assertFalse(
cnt.validate_obj_name_component(obj_comp_name, True))
def test_validate_obj_name_component_err(self):
max_obj_len = cnt.SOF_MAX_OBJECT_NAME_LENGTH
self.assertTrue(cnt.validate_obj_name_component(
'tests' * (max_obj_len / 5 + 1)))
# Non-last object name component - err
for i in (256, 257):
obj_comp_name = 'a' * i
result = cnt.validate_obj_name_component(obj_comp_name)
self.assertEqual(result, "too long (%d)" % i)
# Last object name component - err
for i in (222, 223):
obj_comp_name = 'a' * i
result = cnt.validate_obj_name_component(obj_comp_name, True)
self.assertEqual(result, "too long (%d)" % i)
self.assertTrue(cnt.validate_obj_name_component('.'))
self.assertTrue(cnt.validate_obj_name_component('..'))
self.assertTrue(cnt.validate_obj_name_component(''))
@ -43,4 +59,18 @@ class TestConstraints(unittest.TestCase):
def test_check_object_creation(self):
req = Mock()
req.headers = []
self.assertFalse(cnt.check_object_creation(req, 'dir/z'))
valid_object_names = ["a/b/c/d",
'/'.join(("1@3%&*0-", "};+=]|")),
'/'.join(('a' * 255, 'b' * 255, 'c' * 221))]
for o in valid_object_names:
self.assertFalse(cnt.check_object_creation(req, o))
invalid_object_names = ["a/./b",
"a/b/../d",
"a//b",
"a/c//",
'/'.join(('a' * 256, 'b' * 255, 'c' * 221)),
'/'.join(('a' * 255, 'b' * 255, 'c' * 222))]
for o in invalid_object_names:
self.assertTrue(cnt.check_object_creation(req, o))