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From e78d3bd879b880d679b49f3fa5ebe8009d309063 Mon Sep 17 00:00:00 2001
From: tbordaz <tbordaz@redhat.com>
Date: Fri, 2 Oct 2020 12:03:12 +0200
Subject: [PATCH 1/8] Issue 4297- On ADD replication URP issue internal
searches with filter containing unescaped chars (#4355)
Bug description:
In MMR a consumer receiving a ADD has to do some checking based on basedn.
It checks if the entry was a tombstone or if the conflicting parent entry was a tombstone.
To do this checking, URP does internal searches using basedn.
A '*' (ASTERISK) is valid in a RDN and in a DN. But using a DN in an assertionvalue of a filter, the ASTERISK needs to be escaped else the server will interprete the filtertype to be a substring. (see
https://tools.ietf.org/html/rfc4515#section-3)
The problem is that if a added entry contains an ASTERISK in the DN, it will not be escaped in internal search and trigger substring search (likely unindexed).
Fix description:
escape the DN before doing internal search in URP
Fixes: #4297
Reviewed by: Mark Reynolds, William Brown, Simon Pichugi (thanks !)
Platforms tested: F31
---
.../suites/replication/acceptance_test.py | 63 +++++++++++++++++++
ldap/servers/plugins/replication/urp.c | 10 ++-
ldap/servers/slapd/filter.c | 21 +++++++
ldap/servers/slapd/slapi-plugin.h | 1 +
4 files changed, 93 insertions(+), 2 deletions(-)
diff --git a/dirsrvtests/tests/suites/replication/acceptance_test.py b/dirsrvtests/tests/suites/replication/acceptance_test.py
index 5009f4e7c..661dddb11 100644
--- a/dirsrvtests/tests/suites/replication/acceptance_test.py
+++ b/dirsrvtests/tests/suites/replication/acceptance_test.py
@@ -7,6 +7,7 @@
# --- END COPYRIGHT BLOCK ---
#
import pytest
+import logging
from lib389.replica import Replicas
from lib389.tasks import *
from lib389.utils import *
@@ -556,6 +557,68 @@ def test_csnpurge_large_valueset(topo_m2):
for i in range(21,25):
test_user.add('description', 'value {}'.format(str(i)))
+@pytest.mark.ds51244
+def test_urp_trigger_substring_search(topo_m2):
+ """Test that a ADD of a entry with a '*' in its DN, triggers
+ an internal search with a escaped DN
+
+ :id: 9869bb39-419f-42c3-a44b-c93eb0b77667
+ :setup: MMR with 2 masters
+ :steps:
+ 1. enable internal operation loggging for plugins
+ 2. Create on M1 a test_user with a '*' in its DN
+ 3. Check the test_user is replicated
+ 4. Check in access logs that the internal search does not contain '*'
+ :expectedresults:
+ 1. Should succeeds
+ 2. Should succeeds
+ 3. Should succeeds
+ 4. Should succeeds
+ """
+ m1 = topo_m2.ms["master1"]
+ m2 = topo_m2.ms["master2"]
+
+ # Enable loggging of internal operation logging to capture URP intop
+ log.info('Set nsslapd-plugin-logging to on')
+ for inst in (m1, m2):
+ inst.config.loglevel([AccessLog.DEFAULT, AccessLog.INTERNAL], service='access')
+ inst.config.set('nsslapd-plugin-logging', 'on')
+ inst.restart()
+
+ # add a user with a DN containing '*'
+ test_asterisk_uid = 'asterisk_*_in_value'
+ test_asterisk_dn = 'uid={},{}'.format(test_asterisk_uid, DEFAULT_SUFFIX)
+
+ test_user = UserAccount(m1, test_asterisk_dn)
+ if test_user.exists():
+ log.info('Deleting entry {}'.format(test_asterisk_dn))
+ test_user.delete()
+ test_user.create(properties={
+ 'uid': test_asterisk_uid,
+ 'cn': test_asterisk_uid,
+ 'sn': test_asterisk_uid,
+ 'userPassword': test_asterisk_uid,
+ 'uidNumber' : '1000',
+ 'gidNumber' : '2000',
+ 'homeDirectory' : '/home/asterisk',
+ })
+
+ # check that the ADD was replicated on M2
+ test_user_m2 = UserAccount(m2, test_asterisk_dn)
+ for i in range(1,5):
+ if test_user_m2.exists():
+ break
+ else:
+ log.info('Entry not yet replicated on M2, wait a bit')
+ time.sleep(2)
+
+ # check that M2 access logs does not "(&(objectclass=nstombstone)(nscpentrydn=uid=asterisk_*_in_value,dc=example,dc=com))"
+ log.info('Check that on M2, URP as not triggered such internal search')
+ pattern = ".*\(Internal\).*SRCH.*\(&\(objectclass=nstombstone\)\(nscpentrydn=uid=asterisk_\*_in_value,dc=example,dc=com.*"
+ found = m2.ds_access_log.match(pattern)
+ log.info("found line: %s" % found)
+ assert not found
+
if __name__ == '__main__':
# Run isolated
diff --git a/ldap/servers/plugins/replication/urp.c b/ldap/servers/plugins/replication/urp.c
index 79a817c90..301e9fa00 100644
--- a/ldap/servers/plugins/replication/urp.c
+++ b/ldap/servers/plugins/replication/urp.c
@@ -1411,9 +1411,12 @@ urp_add_check_tombstone (Slapi_PBlock *pb, char *sessionid, Slapi_Entry *entry,
Slapi_Entry **entries = NULL;
Slapi_PBlock *newpb;
char *basedn = slapi_entry_get_ndn(entry);
+ char *escaped_basedn;
const Slapi_DN *suffix = slapi_get_suffix_by_dn(slapi_entry_get_sdn (entry));
+ escaped_basedn = slapi_filter_escape_filter_value("nscpentrydn", basedn);
- char *filter = slapi_filter_sprintf("(&(objectclass=nstombstone)(nscpentrydn=%s))", basedn);
+ char *filter = slapi_filter_sprintf("(&(objectclass=nstombstone)(nscpentrydn=%s))", escaped_basedn);
+ slapi_ch_free((void **)&escaped_basedn);
newpb = slapi_pblock_new();
slapi_search_internal_set_pb(newpb,
slapi_sdn_get_dn(suffix), /* Base DN */
@@ -1602,12 +1605,15 @@ urp_find_tombstone_for_glue (Slapi_PBlock *pb, char *sessionid, const Slapi_Entr
Slapi_Entry **entries = NULL;
Slapi_PBlock *newpb;
const char *basedn = slapi_sdn_get_dn(parentdn);
+ char *escaped_basedn;
+ escaped_basedn = slapi_filter_escape_filter_value("nscpentrydn", basedn);
char *conflict_csnstr = (char*)slapi_entry_attr_get_ref((Slapi_Entry *)entry, "conflictcsn");
CSN *conflict_csn = csn_new_by_string(conflict_csnstr);
CSN *tombstone_csn = NULL;
- char *filter = slapi_filter_sprintf("(&(objectclass=nstombstone)(nscpentrydn=%s))", basedn);
+ char *filter = slapi_filter_sprintf("(&(objectclass=nstombstone)(nscpentrydn=%s))", escaped_basedn);
+ slapi_ch_free((void **)&escaped_basedn);
newpb = slapi_pblock_new();
char *parent_dn = slapi_dn_parent (basedn);
slapi_search_internal_set_pb(newpb,
diff --git a/ldap/servers/slapd/filter.c b/ldap/servers/slapd/filter.c
index c818baec3..d671c87ff 100644
--- a/ldap/servers/slapd/filter.c
+++ b/ldap/servers/slapd/filter.c
@@ -130,6 +130,27 @@ filter_escape_filter_value(struct slapi_filter *f, const char *fmt, size_t len _
return ptr;
}
+/* Escaped an equality filter value (assertionValue) of a given attribute
+ * Caller must free allocated escaped filter value
+ */
+char *
+slapi_filter_escape_filter_value(char* filter_attr, char *filter_value)
+{
+ char *result;
+ struct slapi_filter *f;
+
+ if ((filter_attr == NULL) || (filter_value == NULL)) {
+ return NULL;
+ }
+ f = (struct slapi_filter *)slapi_ch_calloc(1, sizeof(struct slapi_filter));
+ f->f_choice = LDAP_FILTER_EQUALITY;
+ f->f_un.f_un_ava.ava_type = filter_attr;
+ f->f_un.f_un_ava.ava_value.bv_len = strlen(filter_value);
+ f->f_un.f_un_ava.ava_value.bv_val = filter_value;
+ result = filter_escape_filter_value(f, FILTER_EQ_FMT, FILTER_EQ_LEN);
+ slapi_ch_free((void**) &f);
+ return result;
+}
/*
* get_filter_internal(): extract an LDAP filter from a BerElement and create
diff --git a/ldap/servers/slapd/slapi-plugin.h b/ldap/servers/slapd/slapi-plugin.h
index 8d9c3fa6a..04c02cf7c 100644
--- a/ldap/servers/slapd/slapi-plugin.h
+++ b/ldap/servers/slapd/slapi-plugin.h
@@ -5262,6 +5262,7 @@ int slapi_vattr_filter_test_ext(Slapi_PBlock *pb, Slapi_Entry *e, Slapi_Filter *
int slapi_filter_compare(struct slapi_filter *f1, struct slapi_filter *f2);
Slapi_Filter *slapi_filter_dup(Slapi_Filter *f);
int slapi_filter_changetype(Slapi_Filter *f, const char *newtype);
+char *slapi_filter_escape_filter_value(char* filter_attr, char *filter_value);
int slapi_attr_is_last_mod(char *attr);
--
2.26.2
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