112 lines
4.8 KiB
Python
112 lines
4.8 KiB
Python
#!/usr/bin/env python3
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from impacket.ldap import ldapasn1 as ldapasn1_impacket
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from impacket.ldap import ldap as ldap_impacket
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import re
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from nxc.logger import nxc_logger
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class NXCModule:
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"""
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Get description of users
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Module by @nodauf
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"""
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name = "get-desc-users"
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description = "Get description of the users. May contained password"
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supported_protocols = ["ldap"]
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opsec_safe = True # Does the module touch disk?
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multiple_hosts = True # Does it make sense to run this module on multiple hosts at a time?
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def options(self, context, module_options):
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"""
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FILTER Apply the FILTER (grep-like) (default: '')
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PASSWORDPOLICY Is the windows password policy enabled ? (default: False)
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MINLENGTH Minimum password length to match, only used if PASSWORDPOLICY is True (default: 6)
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"""
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self.FILTER = ""
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self.MINLENGTH = "6"
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self.PASSWORDPOLICY = False
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if "FILTER" in module_options:
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self.FILTER = module_options["FILTER"]
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if "MINLENGTH" in module_options:
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self.MINLENGTH = module_options["MINLENGTH"]
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if "PASSWORDPOLICY" in module_options:
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self.PASSWORDPOLICY = True
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self.regex = re.compile("((?=[^ ]*[A-Z])(?=[^ ]*[a-z])(?=[^ ]*\d)|(?=[^ ]*[a-z])(?=[^ ]*\d)(?=[^ ]*[^\w \n])|(?=[^ ]*[A-Z])(?=[^ ]*\d)(?=[^ ]*[^\w \n])|(?=[^ ]*[A-Z])(?=[^ ]*[a-z])(?=[^ ]*[^\w \n]))[^ \n]{" + self.MINLENGTH + ",}") # Credit : https://stackoverflow.com/questions/31191248/regex-password-must-have-at-least-3-of-the-4-of-the-following
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def on_login(self, context, connection):
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"""Concurrent. Required if on_admin_login is not present. This gets called on each authenticated connection"""
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# Building the search filter
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searchFilter = "(objectclass=user)"
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try:
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context.log.debug(f"Search Filter={searchFilter}")
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resp = connection.ldapConnection.search(
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searchFilter=searchFilter,
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attributes=["sAMAccountName", "description"],
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sizeLimit=0,
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)
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except ldap_impacket.LDAPSearchError as e:
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if e.getErrorString().find("sizeLimitExceeded") >= 0:
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context.log.debug("sizeLimitExceeded exception caught, giving up and processing the data received")
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# We reached the sizeLimit, process the answers we have already and that's it. Until we implement
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# paged queries
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resp = e.getAnswers()
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else:
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nxc_logger.debug(e)
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return False
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answers = []
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context.log.debug(f"Total of records returned {len(resp)}")
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for item in resp:
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if isinstance(item, ldapasn1_impacket.SearchResultEntry) is not True:
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continue
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sAMAccountName = ""
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description = ""
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try:
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for attribute in item["attributes"]:
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if str(attribute["type"]) == "sAMAccountName":
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sAMAccountName = str(attribute["vals"][0])
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elif str(attribute["type"]) == "description":
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description = attribute["vals"][0]
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if sAMAccountName != "" and description != "":
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answers.append([sAMAccountName, description])
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except Exception as e:
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context.log.debug("Exception:", exc_info=True)
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context.log.debug(f"Skipping item, cannot process due to error {e!s}")
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answers = self.filter_answer(context, answers)
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if len(answers) > 0:
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context.log.success("Found following users: ")
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for answer in answers:
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context.log.highlight(f"User: {answer[0]} description: {answer[1]}")
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return None
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return None
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def filter_answer(self, context, answers):
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# No option to filter
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if self.FILTER == "" and not self.PASSWORDPOLICY:
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context.log.debug("No filter option enabled")
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return answers
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answersFiltered = []
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context.log.debug("Prepare to filter")
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if len(answers) > 0:
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for answer in answers:
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conditionFilter = False
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description = str(answer[1])
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# Filter
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if self.FILTER != "":
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conditionFilter = False
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if self.FILTER in description:
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conditionFilter = True
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# Password policy
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if self.PASSWORDPOLICY:
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conditionPasswordPolicy = False
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if self.regex.search(description):
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conditionPasswordPolicy = True
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if (conditionFilter == self.FILTER) and (conditionPasswordPolicy == self.PASSWORDPOLICY):
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answersFiltered.append([answer[0], description])
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return answersFiltered
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