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# Copyright 2008 Fred Gansevles <fred@betterbe.com>
#
# This file is part of rdiff-backup.
#
# rdiff-backup is free software; you can redistribute it and/or modify
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# rdiff-backup is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with rdiff-backup; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
import C, metadata, re, rorpiter, rpath
try:
from win32security import *
except:
GROUP_SECURITY_INFORMATION = 0
OWNER_SECURITY_INFORMATION = 0
DACL_SECURITY_INFORMATION = 0
class ACL:
flags = (GROUP_SECURITY_INFORMATION|
OWNER_SECURITY_INFORMATION|
DACL_SECURITY_INFORMATION)
def __init__(self, index=()):
self.__acl = ""
self.index = index
def get_indexpath(self): return self.index and '/'.join(self.index) or '.'
def load_from_rp(self, rp, skip_inherit_only = True):
self.index = rp.index
try:
sd = rp.conn.win32security.GetFileSecurity(rp.path, ACL.flags)
except:
return
if skip_inherit_only:
# skip the inherit_only aces
acl = sd.GetSecurityDescriptorDacl()
if acl:
n = acl.GetAceCount()
# traverse the ACL in reverse, so the indices stay correct
while n:
n -= 1
ace_flags = acl.GetAce(n)[0][1]
if ace_flags & INHERIT_ONLY_ACE:
acl.DeleteAce(n)
sd.SetSecurityDescriptorDacl(1, acl, 0)
if ACL.flags & SACL_SECURITY_INFORMATION:
acl = sd.GetSecurityDescriptorSacl()
if acl:
n = acl.GetAceCount()
# traverse the ACL in reverse, so the indices stay correct
while n:
n -= 1
ace_flags = acl.GetAce(n)[0][1]
if ace_flags & INHERIT_ONLY_ACE:
acl.DeleteAce(n)
sd.SetSecurityDescriptorSacl(1, acl, 0)
self.__acl = \
rp.conn.win32security.ConvertSecurityDescriptorToStringSecurityDescriptor(sd,
SDDL_REVISION_1, ACL.flags)
def clear_rp(self, rp):
# not sure how to interpret this
# I'll jus clear all acl-s from rp.path
sd = rp.conn.win32security.GetFileSecurity(rp.path, ACL.flags)
acl = sd.GetSecurityDescriptorDacl()
if acl:
n = acl.GetAceCount()
# traverse the ACL in reverse, so the indices stay correct
while n:
n -= 1
acl.DeleteAce(n)
sd.SetSecurityDescriptorDacl(1, acl, 0)
if ACL.flags & SACL_SECURITY_INFORMATION:
acl = sd.GetSecurityDescriptorSacl()
if acl:
n = acl.GetAceCount()
# traverse the ACL in reverse, so the indices stay correct
while n:
n -= 1
acl.DeleteAce(n)
sd.SetSecurityDescriptorSacl(1, acl, 0)
SetFileSecurity(rp.path, ACL.flags, sd)
def write_to_rp(self, rp):
if self.__acl:
sd = rp.conn.win32security.ConvertStringSecurityDescriptorToSecurityDescriptor(self.__acl,
SDDL_REVISION_1)
rp.conn.win32security.SetFileSecurity(rp.path, ACL.flags, sd)
def __str__(self):
return '# file: %s\n%s\n' % \
(C.acl_quote(self.get_indexpath()), unicode(self.__acl))
def from_string(self, acl_str):
lines = acl_str.splitlines()
if len(lines) != 2 or not lines[0][:8] == "# file: ":
raise metadata.ParsingError("Bad record beginning: " + lines[0][:8])
filename = lines[0][8:]
if filename == '.': self.index = ()
else: self.index = tuple(C.acl_unquote(filename).split('/'))
self.__acl = lines[1]
def Record2WACL(record):
acl = ACL()
acl.from_string(record)
return acl
def WACL2Record(wacl):
return unicode(wacl)
class WACLExtractor(metadata.FlatExtractor):
"""Iterate ExtendedAttributes objects from the WACL information file"""
record_boundary_regexp = re.compile('(?:\\n|^)(# file: (.*?))\\n')
record_to_object = staticmethod(Record2WACL)
def filename_to_index(self, filename):
"""Convert possibly quoted filename to index tuple"""
if filename == '.': return ()
else: return tuple(C.acl_unquote(filename).split('/'))
class WinAccessControlListFile(metadata.FlatFile):
"""Store/retrieve ACLs from extended_attributes file"""
_prefix = "win_access_control_lists"
_extractor = WACLExtractor
_object_to_record = staticmethod(WACL2Record)
def join_wacl_iter(rorp_iter, wacl_iter):
"""Update a rorp iter by adding the information from acl_iter"""
for rorp, wacl in rorpiter.CollateIterators(rorp_iter, wacl_iter):
assert rorp, "Missing rorp for index %s" % (wacl.index,)
if not wacl: wacl = ACL(rorp.index)
rorp.set_win_acl(unicode(wacl))
yield rorp
def rpath_acl_win_get(rpath):
acl = ACL()
acl.load_from_rp(rpath)
return unicode(acl)
rpath.win_acl_get = rpath_acl_win_get
def rpath_get_blank_win_acl(index):
acl = ACL(index)
return unicode(acl)
rpath.get_blank_win_acl = rpath_get_blank_win_acl
def rpath_set_win_acl(rp, acl_str):
acl = ACL()
acl.from_string(acl_str)
acl.write_to_rp(rp)
rpath.write_win_acl = rpath_set_win_acl
def init_acls():
# A process that tries to read or write a SACL needs
# to have and enable the SE_SECURITY_NAME privilege.
# And inorder to backup/restore, the SE_BACKUP_NAME and
# SE_RESTORE_NAME privileges are needed.
import win32api
try:
hnd = OpenProcessToken(win32api.GetCurrentProcess(),
TOKEN_ADJUST_PRIVILEGES| TOKEN_QUERY)
except win32api.error:
return
try:
try:
lpv = lambda priv: LookupPrivilegeValue(None, priv)
# enable the SE_*_NAME priveleges
SecurityName = lpv(SE_SECURITY_NAME)
AdjustTokenPrivileges(hnd, False, [
(SecurityName, SE_PRIVILEGE_ENABLED),
(lpv(SE_BACKUP_NAME), SE_PRIVILEGE_ENABLED),
(lpv(SE_RESTORE_NAME), SE_PRIVILEGE_ENABLED)
])
except win32api.error:
return
for name, enabled in GetTokenInformation(hnd, TokenPrivileges):
if name == SecurityName and enabled:
# now we *may* access the SACL (sigh)
ACL.flags |= SACL_SECURITY_INFORMATION
break
finally:
win32api.CloseHandle(hnd)
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