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python/samba/samdb: Only do caching of well known DNs in dbcheck

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The fact that get_wellknown_dn() returned a cached DN that could
not be modified safely was unexpected, particularly given that
other similar routines did not do that.

The use case given at the time this was written by
Matthieu Patou in 6122acad0f
was dbcheck, so move the cache there, and name it clearly.

dbcheck is the only case that uses this rotuine in an inner
loop.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Jo Sutton <josutton@catalyst.net.nz>
This commit is contained in:
Andrew Bartlett 2024-02-23 15:32:06 +13:00
parent 5a0fce5865
commit 9a5cc12042
2 changed files with 26 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
python/samba/dbchecker.py
View File

@ -56,6 +56,8 @@ def dump_attr_values(vals):
class dbcheck(object):
"""check a SAM database for errors"""
hash_well_known = {}
def __init__(self, samdb, samdb_schema=None, verbose=False, fix=False,
yes=False, quiet=False, in_transaction=False,
quick_membership_checks=False,
@ -130,9 +132,9 @@ class dbcheck(object):
self.link_id_cache = {}
self.name_map = {}
try:
base_dn = "CN=DnsAdmins,%s" % samdb.get_wellknown_dn(
samdb.get_default_basedn(),
dsdb.DS_GUID_USERS_CONTAINER)
base_dn = "CN=DnsAdmins,%s" % self.get_wellknown_dn_cached(
samdb.get_default_basedn(),
dsdb.DS_GUID_USERS_CONTAINER)
res = samdb.search(base=base_dn, scope=ldb.SCOPE_BASE,
attrs=["objectSid"])
dnsadmins_sid = ndr_unpack(security.dom_sid, res[0]["objectSid"][0])
@ -171,8 +173,8 @@ class dbcheck(object):
for nc in self.ncs:
try:
dn = self.samdb.get_wellknown_dn(ldb.Dn(self.samdb, nc.decode('utf8')),
dsdb.DS_GUID_DELETED_OBJECTS_CONTAINER)
dn = self.get_wellknown_dn_cached(ldb.Dn(self.samdb, nc.decode('utf8')),
dsdb.DS_GUID_DELETED_OBJECTS_CONTAINER)
self.deleted_objects_containers.append(dn)
except KeyError:
self.ncs_lacking_deleted_containers.append(ldb.Dn(self.samdb, nc.decode('utf8')))
@ -243,6 +245,21 @@ class dbcheck(object):
if enum != ldb.ERR_NO_SUCH_OBJECT:
raise
def get_wellknown_dn_cached(self, nc_root, wkguid):
h_nc = self.hash_well_known.get(str(nc_root))
dn = None
if h_nc is not None:
dn = h_nc.get(wkguid)
if dn is None:
dn = self.samdb.get_wellknown_dn(nc_root, wkguid)
if dn is None:
return dn
if h_nc is None:
self.hash_well_known[str(nc_root)] = {}
h_nc = self.hash_well_known[str(nc_root)]
h_nc[wkguid] = dn
return dn
def check_database(self, DN=None, scope=ldb.SCOPE_SUBTREE, controls=None,
attrs=None):
"""perform a database check, returning the number of errors found"""
@ -945,7 +962,7 @@ newSuperior: %s""" % (str(from_dn), str(to_rdn), str(to_base)))
self.samdb.transaction_start()
try:
nc_root = self.samdb.get_nc_root(obj.dn)
lost_and_found = self.samdb.get_wellknown_dn(nc_root, dsdb.DS_GUID_LOSTANDFOUND_CONTAINER)
lost_and_found = self.get_wellknown_dn_cached(nc_root, dsdb.DS_GUID_LOSTANDFOUND_CONTAINER)
new_dn = ldb.Dn(self.samdb, str(obj.dn))
new_dn.remove_base_components(len(new_dn) - 1)
if self.do_rename(obj.dn, new_dn, lost_and_found, ["show_deleted:0", "relax:0"],
@ -2369,8 +2386,8 @@ newSuperior: %s""" % (str(from_dn), str(to_rdn), str(to_base)))
nc_dn = self.samdb.get_nc_root(obj.dn)
try:
deleted_objects_dn = self.samdb.get_wellknown_dn(nc_dn,
samba.dsdb.DS_GUID_DELETED_OBJECTS_CONTAINER)
deleted_objects_dn = self.get_wellknown_dn_cached(nc_dn,
samba.dsdb.DS_GUID_DELETED_OBJECTS_CONTAINER)
except KeyError:
# We have no deleted objects DN for schema, and we check for this above for the other
# NCs

15
python/samba/samdb.py
View File

@ -53,7 +53,6 @@ class SamDB(samba.Ldb):
"""The SAM database."""
hash_oid_name = {}
hash_well_known = {}
class _CleanUpOnError:
def __init__(self, samdb, dn):
@ -1220,19 +1219,7 @@ schemaUpdateNow: 1
return dsdb._dsdb_get_nc_root(self, dn)
def get_wellknown_dn(self, nc_root, wkguid):
h_nc = self.hash_well_known.get(str(nc_root))
dn = None
if h_nc is not None:
dn = h_nc.get(wkguid)
if dn is None:
dn = dsdb._dsdb_get_wellknown_dn(self, nc_root, wkguid)
if dn is None:
return dn
if h_nc is None:
self.hash_well_known[str(nc_root)] = {}
h_nc = self.hash_well_known[str(nc_root)]
h_nc[wkguid] = dn
return dn
return dsdb._dsdb_get_wellknown_dn(self, nc_root, wkguid)
def set_minPwdAge(self, value):
if not isinstance(value, bytes):