Conquering Active Directory's 1000 record limi

Question

PowerShell is capable of pulling list of 1492 records. When I using Python with ldap3 module I'm bumping into 1000 records limit. Please help me change Python code to exceed the limit.

PowerShell input: get-aduser -filter * -SearchBase "OU=SMZ USERS,OU=SMZ,OU=EUR,DC=my_dc,DC=COM" | Measure-Object

output: Count : 1492 Average : Sum : Maximum : Minimum : Property :

import json
from ldap3 import Server, \
Connection, \
AUTO_BIND_NO_TLS, \
SUBTREE, \
ALL_ATTRIBUTES

def get_ldap_info(u):
with Connection(Server('my_server', port=636, use_ssl=True),
                auto_bind=AUTO_BIND_NO_TLS,
                read_only=True,
                check_names=True,
                user='my_login', password='my_password') as c:

    c.search(search_base='OU=SMZ Users,OU=SMZ,OU=EUR,DC=my_dc,DC=com',
             search_filter='(&(samAccountName=' + u + '))',        
             search_scope=SUBTREE,
             attributes=ALL_ATTRIBUTES,
             size_limit = 0,
             paged_criticality = True,                 
             paged_size = None,
             #attributes = ['cn'],
             get_operational_attributes=True)        

    content = c.response_to_json()
result = json.loads(content)
i = 0
for item in result["entries"]:
    i += 1
print(i)  
get_ldap_info('*')

Answer 1

If you change your code to using the paged_search method of the extend.standard namespace instead you should be able to retrieve all the results you are looking for.

Just be aware that you will need to treat the response object differently.

def get_ldap_info(u):
with Connection(Server('XXX', port=636, use_ssl=True),
                auto_bind=AUTO_BIND_NO_TLS,
                read_only=True,
                check_names=True,
                user='XXX', password='XXX') as c:

    results = c.extend.standard.paged_search(search_base='dc=XXX,dc=XXX,dc=XXX',
             search_filter='(&(samAccountName=' + u + '))',        
             search_scope=SUBTREE,
             attributes=ALL_ATTRIBUTES,
             #attributes = ['cn'],
             get_operational_attributes=True)        


i = 0
for item in results:
    #print(item)
    i += 1
print(i)  
get_ldap_info('*')

Answer 2

I have no idea what PowerShell does to get more records, but recent LDAP servers have a 1000 record search result limit. There's nothing Python can do to change that. You have to raise the limit in the server configuration, or find a workaround in your script.