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CVE-2023-4154 python:sd_utils: add dacl_{prepend,append,delete}_aces() helpers

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They better represent what they are doing, we keep dacl_add_ace()
as wrapper of dacl_prepend_aces() in order to let existing callers
work as before.

In future it would be good to have a dacl_insert_aces() that
would canonicalize the ace order before storing, but that a task
for another day.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15424

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>

(cherry picked from commit a1109a9bf1)
This commit is contained in:
Stefan Metzmacher
2023-03-16 18:03:10 +01:00
committed by Jule Anger
parent 60baeea804
commit d038ac36c1
1 changed files with 34 additions and 5 deletions
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39
python/samba/sd_utils.py
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@ -165,17 +165,46 @@ class SDUtils(object):
return del_ignored, add_ignored, inherited_ignored
def dacl_add_ace(self, object_dn, ace):
"""Add an ACE (or more) to an objects security descriptor
def dacl_prepend_aces(self, object_dn, aces, controls=None):
"""Prepend an ACE (or more) to an objects security descriptor
"""
ace_sd = security.descriptor.from_sddl("D:" + ace, self.domain_sid)
ace_sd = security.descriptor.from_sddl("D:" + aces, self.domain_sid)
add_aces = []
add_idx = 0
for ace in ace_sd.dacl.aces:
add_aces.append({"idx": add_idx, "ace": ace})
add_idx += 1
_,_,_ = self.update_aces_in_dacl(object_dn, add_aces=add_aces,
controls=["show_deleted:1"])
_,ai,ii = self.update_aces_in_dacl(object_dn, add_aces=add_aces,
controls=controls)
return ai, ii
def dacl_add_ace(self, object_dn, ace):
"""Add an ACE (or more) to an objects security descriptor
"""
_,_ = self.dacl_prepend_aces(object_dn, ace,
controls=["show_deleted:1"])
def dacl_append_aces(self, object_dn, aces, controls=None):
"""Append an ACE (or more) to an objects security descriptor
"""
ace_sd = security.descriptor.from_sddl("D:" + aces, self.domain_sid)
add_aces = []
for ace in ace_sd.dacl.aces:
add_aces.append(ace)
_,ai,ii = self.update_aces_in_dacl(object_dn, add_aces=add_aces,
controls=controls)
return ai, ii
def dacl_delete_aces(self, object_dn, aces, controls=None):
"""Delete an ACE (or more) to an objects security descriptor
"""
del_sd = security.descriptor.from_sddl("D:" + aces, self.domain_sid)
del_aces = []
for ace in del_sd.dacl.aces:
del_aces.append(ace)
di,_,ii = self.update_aces_in_dacl(object_dn, del_aces=del_aces,
controls=controls)
return di, ii
def get_sd_as_sddl(self, object_dn, controls=[]):
"""Return object nTSecutiryDescriptor in SDDL format